Bogie Design Features in WAP5 Locomotives

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Questions and Answers

What is the primary function of the bogie in a train?

  • To enhance the aesthetic design of the train
  • To absorb and isolate shocks from track vibrations (correct)
  • To increase the speed of the train
  • To support the passenger compartments

How do traction motors transmit energy to the driving axles?

  • By using a gearbox mounted on the driving axles (correct)
  • Through a direct connection
  • Through pneumatic systems
  • Via the wheel treads

What role do the primary and secondary suspensions play in the bogie system?

  • They control the train's speed and direction
  • They isolate and absorb shock loads and vibrations (correct)
  • They enhance the engine's fuel efficiency
  • They assist in loading and unloading cargo

What component transmits tractive forces from the bogie to the locomotion car body?

<p>Low traction bar (C)</p> Signup and view all the answers

Which of the following correctly describes the damping system in the bogie?

<p>It employs both vertical hydraulic dampers and coil springs (D)</p> Signup and view all the answers

What is the function of yaw dampers in the bogie system?

<p>To control the car body pitch rate (D)</p> Signup and view all the answers

Which braking system is NOT mentioned as being part of the WAG9 loco?

<p>Magnetic track brake (C)</p> Signup and view all the answers

Which type of springs are used in the primary suspension of the bogie?

<p>Twin coil springs (C)</p> Signup and view all the answers

How does the system limit lateral movement in the bogie?

<p>Through lateral buffers and dampers (C)</p> Signup and view all the answers

What is the function of guide rods in the bogie?

<p>To control fore and aft movement between the axles and the bogie frame (A)</p> Signup and view all the answers

What type of bogie is equipped on the WAP5 locomotive?

<p>2-axle bolster less Bo-Bo bogie (D)</p> Signup and view all the answers

What feature of the WAP5 bogie helps in reducing vibrations of the locomotive body?

<p>Hydraulic dampers (C)</p> Signup and view all the answers

How is the transverse flexibility between the car body and bogie achieved?

<p>Through the flexi-coil action of secondary helical springs (D)</p> Signup and view all the answers

Which braking systems are utilized in the WAP5 locomotive?

<p>Automatic train brake, Direct loco brake, parking brake, Anti spin brake (A)</p> Signup and view all the answers

What is the main advantage of the fully suspended traction motor in the WAP5 locomotive?

<p>Reduces the unsprung mass and improves riding at high speeds (B)</p> Signup and view all the answers

What is the configuration of the WAG9 locomotive's bogie assembly?

<p>Three-axle, three motor Co-Co bogie (C)</p> Signup and view all the answers

What key advantage does the smaller wheelbase of the 2-axle bogie provide?

<p>Improves curving behavior allowing for higher speeds (D)</p> Signup and view all the answers

How do traction links function in the WAP5 bogie?

<p>They transfer traction forces from the axle to the bogie frame (C)</p> Signup and view all the answers

What design feature of the WAP5 bogie aids in consistent damping force?

<p>Special design dampers in longitudinal mode (A)</p> Signup and view all the answers

What is the primary function of the low traction bars in the WAP5 locomotive?

<p>To transmit traction and braking forces from the bogie to underframe (A)</p> Signup and view all the answers

What is the primary function of the guide rods in a locomotive?

<p>To provide longitudinal control and transmission of force. (C)</p> Signup and view all the answers

Which component allows lateral movement of the axle without restriction?

<p>Spheribloc rubber bushes (D)</p> Signup and view all the answers

What role do the secondary suspension components play in a locomotive?

<p>Support the weight of the locomotive car body. (C)</p> Signup and view all the answers

What does the 'Flexi Float' arrangement in secondary suspension allow?

<p>Both lateral and vertical movement of the car body. (A)</p> Signup and view all the answers

Which of the following components is NOT part of the secondary suspension system?

<p>Primary suspension damper (D)</p> Signup and view all the answers

What mechanism is used for the lateral and vertical dampening in the secondary suspension?

<p>Vertical hydraulic dampers (C)</p> Signup and view all the answers

Which option correctly identifies a safety feature in the bogie system?

<p>Safety chain (D)</p> Signup and view all the answers

What does the secondary suspension vertical damper primarily control?

<p>Vertical movements and vibrations (A)</p> Signup and view all the answers

Which component is responsible for lubricating wheel flanges?

<p>Wheel flange lubrication reservoir (A)</p> Signup and view all the answers

How does the presence of brake blocks affect the bogie system?

<p>They are essential for the braking process. (C)</p> Signup and view all the answers

What mechanism is primarily responsible for minimizing shock transmission to the locomotive underframe?

<p>Primary suspension (B)</p> Signup and view all the answers

Which component functions to transmit tractive forces from the driving axles to the bogie frame?

<p>Axle journal boxes (C)</p> Signup and view all the answers

What type of springs are utilized for the primary suspension between the axles and the bogie frame?

<p>Coil springs (C)</p> Signup and view all the answers

Which aspect of the bogie assembly helps to control the fore and aft movement between the axles and the bogie frame?

<p>Link rods (D)</p> Signup and view all the answers

What is the function of the vertical hydraulic dampers in the primary suspension system?

<p>To limit vertical rebound rate (D)</p> Signup and view all the answers

Which component is designed to restrict lateral movement of the locomotive car body?

<p>Lateral buffers (A)</p> Signup and view all the answers

What feature allows the axle to have lateral movement in the bogie system?

<p>Flexicoil arrangement (A)</p> Signup and view all the answers

Which braking system allows the locomotive to remain stationary when parked?

<p>Parking brake (D)</p> Signup and view all the answers

What type of dampers control the pitch rate of the car body?

<p>Yaw dampers (A)</p> Signup and view all the answers

What component connects between the bogie transom and the car underframe to transmit tractive forces?

<p>Low traction bar (D)</p> Signup and view all the answers

What design feature of the WAP5 bogie enhances its ability to navigate curves at higher speeds?

<p>Flexi-float suspension arrangement (C)</p> Signup and view all the answers

Which specific function does the hydraulic dampers serve in the WAP5 bogie system?

<p>Reducing vibrations (B)</p> Signup and view all the answers

What impact does the two-stage suspension of the WAP5 bogie have on locomotive performance?

<p>Improves ride comfort (C)</p> Signup and view all the answers

How is the braking force transferred from the WAP5 bogie to the underframe?

<p>Through axle journal boxes and guide rods (A)</p> Signup and view all the answers

Which component is specifically provided to cushion the lateral motion of the traction motor in the WAP5 bogie?

<p>Special design dampers (C)</p> Signup and view all the answers

What mechanical arrangement is employed to ensure transverse flexibility in the WAP5 bogie?

<p>Flexi-coil action of secondary helical springs (A)</p> Signup and view all the answers

What specific characteristic of the WAG9 bogie assembly supports the locomotive's weight?

<p>Three-axle configuration (A)</p> Signup and view all the answers

In the WAP5 locomotive, what is the primary purpose of the low traction bars?

<p>To improve riding behavior (A)</p> Signup and view all the answers

What structural advantage does the 'Flexi Float' arrangement provide to the locomotive car body?

<p>It allows for lateral and vertical movement within defined limits. (B)</p> Signup and view all the answers

What is the primary role of spheribloc rubber bushes in the guide rods?

<p>To allow lateral movement of the axle without undue restriction. (D)</p> Signup and view all the answers

Which feature contributes to the reduction of unsprung mass in the WAP5 bogies?

<p>Fully suspended traction motors (B)</p> Signup and view all the answers

What is a significant advantage of having hydraulic dampers in both vertical and lateral modes in the WAP5 bogie?

<p>Ensure stability and ride comfort (A)</p> Signup and view all the answers

Which component in the secondary suspension primarily contributes to vertical damping?

<p>Secondary suspension vertical damper (C)</p> Signup and view all the answers

What type of suspension springs support the weight of the locomotive car body?

<p>Coil springs (A)</p> Signup and view all the answers

How does the design of guide rods affect the transfer of forces to the bogie frame?

<p>They provide both tractive and braking effort transmission. (A)</p> Signup and view all the answers

What is a characteristic feature of the secondary suspension system as described?

<p>It includes yaw dampers for improved stability. (A)</p> Signup and view all the answers

Which element primarily ensures the rigidity and stability of the bogie assembly?

<p>Bogie frame (C)</p> Signup and view all the answers

In what way do wheel flange lubrication reservoirs contribute to the performance of the bogie?

<p>They reduce friction between the wheels and tracks. (C)</p> Signup and view all the answers

What function do the safety chains serve in the bogie system?

<p>To maintain coupling between bogies and locomotives. (B)</p> Signup and view all the answers

What critical function does the bogie perform in relation to track vibrations?

<p>Absorbs and isolates shocks from track vibrations. (B)</p> Signup and view all the answers

What is the role of the low traction bar in the bogie system?

<p>Transmits tractive forces to the car body. (C)</p> Signup and view all the answers

Which component in the bogie helps control lateral movement?

<p>Lateral buffers (A)</p> Signup and view all the answers

What type of suspension is located between the axles and the bogie frame?

<p>Primary suspension (D)</p> Signup and view all the answers

What is the purpose of the vertical hydraulic dampers in the primary suspension?

<p>To dampen the rebound rate of the springs. (C)</p> Signup and view all the answers

What is a key feature of the 'Flexicoil' arrangement in the bogie?

<p>It allows lateral movement of the axle. (C)</p> Signup and view all the answers

Which braking system is included in the WAG9 locomotive?

<p>Automatic train brake (A)</p> Signup and view all the answers

What is controlled by yaw dampers in the bogie system?

<p>Car body pitch rate (B)</p> Signup and view all the answers

Which component limits the amount and rate of vertical rebound of the locomotive car body?

<p>Rebound limit change dampers (B)</p> Signup and view all the answers

What type of bogies does the WAP5 locomotive utilize?

<p>2-axle bolster less Bo-Bo bogies (B)</p> Signup and view all the answers

What is the role of hydraulic dampers in the WAP5 bogie system?

<p>To reduce locomotive vibrations (D)</p> Signup and view all the answers

Which braking system is included in the WAP5 locomotive design?

<p>Pneumatic train brake (A)</p> Signup and view all the answers

What advantage does the flexi-float suspension provide in the WAP5 bogie?

<p>Allows better curving behaviour (D)</p> Signup and view all the answers

How does the design of the WAP5 bogie contribute to higher speed capabilities?

<p>Through fully suspended traction motors (A)</p> Signup and view all the answers

What controls the lateral motion of the traction motor in the WAP5 bogie?

<p>Specially designed dampers (A)</p> Signup and view all the answers

Which design feature of the WAP5 bogie helps in dampening lateral vibrations?

<p>Secondary helical springs (B)</p> Signup and view all the answers

What is the primary function of the traction and braking forces in the WAP5 locomotive?

<p>To transmit forces from the bogie to the underframe (D)</p> Signup and view all the answers

What special design feature is implemented in the hydraulic dampers of the WAP5 bogie?

<p>Constant damping force in longitudinal mode (D)</p> Signup and view all the answers

What is a unique characteristic of the WAG9 locomotive's bogie assembly?

<p>Has a 3-axle, 3-motor configuration (A)</p> Signup and view all the answers

What type of bushes are used in the guide rods to allow lateral movement of the axle?

<p>Spheribloc rubber bushes (C)</p> Signup and view all the answers

Which component of the secondary suspension is responsible for vertical damping?

<p>Vertical hydraulic dampers (D)</p> Signup and view all the answers

What does the 'Flexi Float' arrangement in secondary suspension allow the car body to do?

<p>Move laterally and vertically (C)</p> Signup and view all the answers

Which component connects the axle journal boxes to the bogie frame for longitudinal control?

<p>Guide rods (D)</p> Signup and view all the answers

What primary function do coil springs serve in the bogie system?

<p>Carrying the weight of the car body (D)</p> Signup and view all the answers

Which component is used to dampen the lateral movement in the secondary suspension?

<p>Yaw damper (D)</p> Signup and view all the answers

Which design feature enhances the comfort level of the locomotive during movement?

<p>Spheribloc rubber bushes (C)</p> Signup and view all the answers

What primary role do hydraulic dampers serve in the bogie system?

<p>To control pitch rate (C)</p> Signup and view all the answers

Which component helps prevent excessive movements of the vehicle during dynamic operations?

<p>Horizontal damper (D)</p> Signup and view all the answers

What is the primary purpose of a sanding box in the bogie assembly?

<p>To enhance wheel traction (A)</p> Signup and view all the answers

Flashcards

WAP5 Bogie Design

The WAP5 locomotive uses a 2-axle, bolster-less Bo-Bo bogie with fully suspended traction motors. This design reduces unsprung weight.

WAP5 Bogie Suspension

The WAP5 bogie has two suspension stages: secondary helical springs supporting the loco body and primary helical springs supporting the bogie frame.

WAP5 Bogie Dampers

Hydraulic dampers in vertical and lateral modes reduce vibrations in the locomotive.

WAP5 Bogie Traction Transfer

Traction and braking forces are transferred from the axles to the bogie frame and then to the underframe through traction bars.

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WAP5 Bogie Breaking System

The WAP5 locomotive has various pneumatic braking systems (automatic train brake, direct loco brake, parking brake, and anti-spin brake) including disc brakes for faster braking.

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WAP5 Bogie Traction Motor

Fully suspended traction motors reduce unsprung mass and improve high-speed riding.

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WAG9 Bogie Type

The WAG9 locomotive uses a three-axle, three-motor Co-Co bogie assembly; two support the weight and transfer power to the track.

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Co-Co Bogie

A type of locomotive bogie arrangement with three axles (Co-Co) and three motors.

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Unsprung Mass

Parts of a vehicle not supported by the suspension system. Reducing unsprung mass leads to a smoother ride.

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Flexi-Float Suspension

A suspension system designed to improve curving behavior and allow higher negotiating speeds on curves.

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Bogie Function

Absorbs and isolates shocks from track vibrations, minimizing stress on the locomotive.

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Suspension System

Minimizes shock transmission from track to locomotive underframe.

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Traction Motors

Power the driving axles of the locomotive.

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Gearbox Function

Transmits motor energy to the driving axle.

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Braking Effort

Transmitted to bogie frame through axle journal boxes and guide rods.

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Primary Suspension

Located between axles and bogie frame, using coil springs and dampers.

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Lateral Movement

Limited by lateral buffers and dampers.

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Vertical Rebound

Limited by vertical dampers on the primary suspension.

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Guide Rods Function

Control fore and aft movement between axles and bogie frame.

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Low Traction Bar

Transmits tractive forces from bogie to the locomotive body.

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Spheribloc Bushings

Rubber bushes in guide rods allow lateral axle movement without hindering it.

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Secondary Suspension

Coil springs and hydraulic dampers between bogie frame and locomotive underframe supporting the car body.

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Flexi Float

Secondary suspension allowing locomotive car body lateral and vertical movement (within limits) relative to bogies.

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Bogie Frame

Structure in a locomotive that supports the wheels, suspension, and other components.

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Wheel Set

A set of wheels and axles.

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Brake System Components

Brake blocks, lever, cylinder, and rod for applying brakes on the wheel.

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Secondary Suspension Springs

Springs that hold up the main body of the locomotive.

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Yaw Damper

Dampers that prevent rotating movements in the locomotive.

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WAP5 Traction Transfer

Traction and braking forces are transferred from the axles to the bogie frame and then to the underframe through traction bars.

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WAP5 Breaking System

The WAP5 locomotive has various pneumatic braking systems (automatic train brake, direct loco brake, parking brake, and anti-spin brake) including disc brakes for faster braking.

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Unsprung Mass Reduction

Fully suspended traction motors in WAP5 bogies reduce unsprung mass, improving high-speed riding.

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Secondary Suspension Function

The secondary suspension, using helical springs, supports the loco body and allows for lateral and vertical movement.

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Guide Rods

Guide rods connect the axle journal boxes to the bogie frame, providing longitudinal control and transmitting traction and braking forces.

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Braking Effort Transmission

Braking forces are transmitted from the axles to the bogie frame and then to the locomotive frame through axle journal boxes, guide rods, and traction rods.

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Lateral Movement Control

Lateral buffers and dampers limit the amount and rate of lateral movement between the bogie and the locomotive body.

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Suspension System Role

The suspension system minimizes shock transmission from the track to the locomotive's underframe.

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Traction Motors' Purpose

Traction motors power the driving axles of the locomotive.

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Braking Effort Transfer

Braking effort is transmitted to the bogie frame through axle journal boxes and guide rods.

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Primary Suspension Location

The primary suspension is located between the axles and the bogie frame, using coil springs and dampers.

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Vertical Rebound Control

Vertical dampers on the primary suspension limit the amount and rate of the vertical rebound of the locomotive car body.

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Low Traction Bar Role

The low traction bar transmits tractive forces from the bogie to the locomotive body.

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WAP5 Suspension Stages

The WAP5 bogie has two suspension stages: secondary helical springs supporting the loco body and primary helical springs supporting the bogie frame.

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WAP5 Traction Motor Suspension

Fully suspended traction motors in the WAP5 bogie reduce unsprung mass, leading to improved riding quality at high speeds.

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What is the function of guide rods?

Guide rods connect the axle journal boxes to the bogie frame, providing longitudinal control and transmitting traction and braking forces.

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What type of suspension system does a locomotive use?

A locomotive's suspension consists of two stages: primary suspension, connecting the axles to the bogie frame, and secondary suspension, supporting the locomotive body on the bogie frame.

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What are the purposes of primary suspension?

The primary suspension, located between the axles and the bogie frame, utilizes coil springs and dampers to absorb vertical shocks and control lateral movements.

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What are the key components of the secondary suspension?

The secondary suspension, which supports the locomotive body, comprises coil springs and vertical hydraulic dampers located between the bogie frame and the locomotive underframe.

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What is the function of the 'Flexi Float' arrangement?

The 'Flexi Float' secondary suspension system allows the locomotive car body to move both laterally and vertically within certain limits relative to the bogies, enhancing stability and ride quality.

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What is the purpose of wheel flange lubrication?

Wheel flange lubrication helps to reduce friction and wear between the wheel flange and the rails, improving performance and extending the life of both components.

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How does the braking system work?

The braking system uses brake blocks, levers, cylinders, and rods to apply force to the wheel sets, halting the locomotive. It involves a series of components that work together to slow down or stop the locomotive.

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What is the function of the secondary suspension springs?

Secondary suspension springs support the weight of the locomotive body, providing a smooth ride and absorbing shocks from the track.

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What is the purpose of the yaw damper?

The yaw damper prevents the locomotive from rotating or swinging sideways, enhancing stability and preventing unwanted movements.

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How is tractive effort transmitted?

Tractive effort, which is the force that propels the locomotive, is transmitted from the axles to the bogie frame and then to the underframe through traction links, axle journal boxes, and guide rods.

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Study Notes

Bogie Design Features

  • WAP5 locomotives use 2-axle, bolster-less Bo-Bo bogies with fully suspended traction motors. This reduces unsprung mass.
  • The bogie has two suspension stages. The loco body rests on secondary helical springs on long bogie beams. The bogie frame is supported by primary helical springs on the axle boxes.
  • Secondary helical springs provide transverse flexibility between the car body and bogie.
  • Hydraulic dampers are used to reduce locomotive body vibrations in vertical and lateral modes. Dampers are placed between the underframe and bogie frame (secondary) and between axle boxes and bogie frame (primary). Longitudinal dampers provide constant damping force. Dampers on each traction motor cushion lateral motor motion.
  • Traction links transfer traction forces from the axle to the bogie frame. Traction and braking forces are transmitted from the bogie to the underframe through traction bars, connected near the centre of the underframe for improved riding.
  • WAP5 locomotives use automatic train brake, direct loco brake, parking brake, and anti-spin brake. Braking effort is transferred to the bogie frame by axle journal boxes and guide rods, then to the locomotive by traction rods. Disc brakes improve braking efficiency for high-speed operation.

WAG9 Locomotive Bogie

  • The WAG9 locomotive uses a 3-axle, 3-motor Co-Co bogie assembly.
  • The bogie assembly supports the locomotive's weight and transmits tractive effort to the rails.
  • The bogie design is robust to withstand stress and vibrations from normal rolling stock use.
  • The bogie's suspension system minimizes vibration transfer to the locomotive underframe.
  • Traction motors are suspended in the bogie frame and on individual axles; they transmit energy to the driving axles.
  • Twin coil springs, with vertical hydraulic dampers, form the primary suspension between the axles and the bogie frame, permitting lateral axle movement.
  • Secondary coil springs and vertical hydraulic dampers provide suspension between the bogie frame and the locomotive underframe.
  • This 'Flexi-Float' arrangement allows lateral and vertical movement of the locomotive body relative to the bogies within limits.

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