40 Questions
How many hose clips are required for thermit welding?
4 Nos.
What is the size of the rail file mentioned in the content?
350 × 40 × 6 mm
What is the purpose of the insulation hood for control cooling?
For 110 UTS rail welding
How many rail profile guided grinding trolleys are required?
1 No.
What is the expected life of the weld trimmer (cutter)?
100
What should always be available for crucible lining?
Magnesite powder and sodium silicate
On what basis should the equipment be replaced if the expected life is not given?
Condition basis
What should be followed as per the approved AT welding technique?
Critical process timing
What is the purpose of providing SEJs at either end of a stretch of track?
To isolate the stretch of track from the remaining portion of LWR/CWR
What is the primary requirement before laying LWR/CWR?
Completing all preliminary works
What is the purpose of a detailed plan in LWR/CWR?
To show the exact locations of various features mentioned in the content
What is the typical scale of a detailed plan for LWR/CWR?
1:5000
How many rail pieces are required for laying one LWR?
Four
What is the purpose of fishplates in LWR/CWR?
To connect rail pieces together
What is the purpose of rail closures in LWR/CWR?
To fill gaps in the track
What is the purpose of de-stressing equipment in LWR/CWR?
To release stresses in the rails
What is the primary cause of buckling of track?
High compressive forces in the rails
What is a sign of a track being subjected to undue strain?
Jammed rail joints
When should operations that impair lateral resistance be avoided?
During hot weather
What is the purpose of a joint gap survey?
To adjust joint gaps before hot weather
Why is it important to lubricate rail joints?
To prevent buckling of track
What is the result of inadequate expansion gaps in the track?
High compressive forces in the rail
What can cause impairing of lateral resistance in the track?
Inadequate ballast and deep screening
When should the greasing of fishplates be done?
Before the onset of hot weather
What should be removed before welding on an LWR?
Fastenings for 20 m on each end
What is the purpose of creating a gap of 1 m at location 'B'?
To allow for free movement of rail
What determines the anchor length 'la'?
The lowest value of tp
Why should the anchor length be increased?
Based on the condition of the fastenings, rubber pads, liners or ballast
What is the purpose of marking distances W0 W1, etc.?
To track the progress of de-stressing
What happens when tP is less than the desired to?
The de-stressing operation begins
What is done to the portion from A2 C2 during de-stressing?
It is unfastened and mounted on rollers
What is the purpose of de-stressing?
To allow free movement of rail
Who is responsible for performing detailed calculations to ascertain the effect of LWR on bridges with ballasted deck?
Design office of Chief Bridge Engineer
What is the condition for permitting LWR/CWR on bridges with ballasted deck?
Based on detailed calculations
What type of fastenings are required for bridges with un-ballasted deck?
Rail-free fastenings
What is the maximum length of the bridge that does not exceed the stipulations in Table-1?
30.5 meters
What is the purpose of providing PRC sleepers with elastic rail clips on the approach track?
To arrest creep
What is the location of the SEJ of the LWR in relation to the bridge?
Such that the bridge does not fall in the breathing length of the LWR
What is the condition for the ballast section of the approach track?
It should be well-compacted and consolidated during the months of extreme summer and winter
What is the length of the approach track that should be well-anchored by providing PRC sleepers with elastic rail clips?
50 meters
Study Notes
Thermit Welding Team Equipment
- Hose clips: 4 Nos.
- Pliers: 1 No.
- Rail file: 350 × 40 × 6 mm (For Emergency use only), 4 Nos.
- Weld trimmer (Cutter): 1 No.
- Insulation hood for control cooling: 1 No.
- Rail profile guided grinding trolley (Grinding wheel): 1 No.
- Protective clothing, shoes gear, and Leather gloves: must be available to ensure quality.
Composition of Thermit Welding Team
- The team should have specific equipment, including compressor tank-wise, depending on the requirement.
Laying Long Welded Rails (LWR)
- Materials required: • 4 metre or longer rail pieces of the same rail section as LWR • 2 sets of SEJs with sleepers and fastenings • Adequate numbers of 1 metre long fishplates with special screw clamps/joggled fishplates with slotted grooves and bolted clamps • Rail closures of suitable sizes • 1 metre and 10 cm straight edges • Callipers and feeler gauges (2 mm to 0.1 mm) • Rail cutting equipment • De-stressing equipment
Buckling of Track
- Buckling occurs when high compressive forces are created in the rails due to inadequacy of lateral resistance in the track.
- Conditions that induce buckling: • Inadequate expansion gaps • Failure to counteract creep in time • Non-lubrication of rail joints
- Precautions against buckling: • Avoid operations that impair lateral resistance during high rail temperatures • Grease fishplates before hot weather • Adjust joint gaps in SWR and free rail track before hot weather
Bridges with Ballasted Deck (with bearing)
- Detailed calculations are required by the Design office to ascertain the effect of LWR on bridges and their sub-structure.
- LWR/CWR may be permitted on a case-to-case basis based on calculations.
Bridges with Un-Ballasted Deck
- LWR/CWR shall be continued over bridges with specific overall lengths and conditions.
De-stressing with Rail Tensors
- Procedure for de-stressing of LWR with rail tensor: • De-stress in parts if LWR is longer than manageable lengths • Remove impediments to free movement of rail • Create a gap of 1 m at the centre of the first segment of the LWR • Mark anchor length and transfer marks onto the rail foot • De-stress operation shall be carried out when tP is less than the desired to
This quiz covers the tools and equipment required for railway maintenance, including hose clips, pliers, rail files, and more.
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