40 Questions
What is the maximum recording speed of Contact gauge sensor?
100 Kmph
Why should quick calibration be done before starting any run?
To ensure accurate recording of track parameters
What is the minimum speed required for track parameter recording?
20 Kmph
What happens to recordings done below a speed of 20 Kmph?
They are recorded as 'Non-recorded'
Who is responsible for coordinating the placement and watering of the TRC special?
ADENs & SSEs
Who should accompany the TRC run in their sections?
Sectional Sr.DEN/DEN, ADEN and SSE/P.Way
What is the purpose of the Track Recording Car?
To assess ride quality in terms of acceleration peaks and Ride Index
Who issues the monthly program for running of TRCs on various zonal railways?
RDSO
Where should the OMS equipment be kept on the coach floor?
On the free end of the coach
How often should OMS recording be done on routes with speeds above 100 kmph?
Once every month
What is the threshold for vertical and lateral acceleration peaks on routes with speeds above 110 kmph?
Greater than 0.15 g
What is the classification of track quality based on the average total number of peaks per km?
Very Good, Good, Average, Poor
What is the purpose of the Oscillograph car?
To monitor the riding quality of the track
Where is the accelerometer placed in the Oscillograph car?
As close to the bogie pivots as possible
What is the speed range for which the track quality classification is based on less than 1.5, 1.5-3.0, and greater than 3 peaks per km?
Speed up to 110 kmph
What is the purpose of uploading stored data in TMS?
For analysis and maintenance planning
What is the frequency of Track geometry monitoring by TRC on routes with speeds above 130 Kmph?
Once in 2 months
What is the nominal gauge for Indian Railways?
1676 mm
What is the purpose of the Track Recording Cars?
To measure the track geometry parameters
How many user selectable chords/bases can be used for measurement and calculation of track geometry parameters?
Two
What is the range of the chords/bases that can be used for measurement and calculation of track geometry parameters?
2 to 20 metres
What is measured by the Track Recording Cars in terms of accelerations?
Vertical and lateral accelerations on coach floor above bogie pivot
What is the term used for the shorter chord/base in the Track Recording Cars?
Short chord/base
What is uploaded in TMS by RDSO officials?
The soft copy of the TRC recording
What is the primary reason for examining all available evidence in derailment cases?
To determine the cause of the accident
What is the purpose of the provisions and tolerances mentioned in the manual?
To maintain track geometry for good riding comfort
What is included in the typical statement prepared in connection with an Oscillograph car run?
Station yard data with peaks above threshold values
Why should deviation from maintenance parameters not be considered alone for the cause of an accident?
Because other factors may have contributed to the accident
What is the total length of the section mentioned in the statement?
232 kms
What is the speed of the locomotive mentioned in the statement?
100 kmph
What is the purpose of examining all available evidence in respect of track, rolling stock, speed, and other factors?
To determine the cause of the accident
What is the date of recording mentioned in the statement?
22nd March 2019
What is the maximum interval at which the Sectional Sr.DEN/DEN should review the need for maintenance of track of each block section/yard?
Six months
What is the primary factor that determines the riding comfort on a curve?
Station to station variation of actual versine values
What is the limit of station to station variation of versine for speeds of 160 Kmph and up?
10 mm
What is the procedure to be followed when the variation of versine between adjacent stations exceeds the limit?
Resort to local adjustments at the earliest possible
What is the purpose of reviewing the need for maintenance of track of each block section/yard?
To plan for through tamping
How often should the Sectional Sr.DEN/DEN review the need for maintenance of track of each block section/yard?
At suitable intervals not greater than six months
What is the limit of station to station variation of versine for speeds below 50 Kmph?
40 mm
What is the process of proposing through tamping of a section?
Through Sr.DEN/DEN of section to Sr.DEN/Coordination of Division
Study Notes
Gauge Measurement
- There are two types of gauge sensors used on Indian Railways: contact gauge sensors (up to 100 kmph) and contactless laser-based gauge sensors (up to 160 kmph).
Quick Calibration, Recording, and Speed
- The track recording car must be calibrated before each run, during daylight hours only.
- The car must run through main lines at all stations, and its speed should be at least 20 kmph for accurate recording.
- Recording is considered "non-recorded" if done below 20 kmph.
Arrangements for Running Track Recording Car
- The zonal railways arrange for power, crew, and consumables for the Track Recording Car, following the RDSO program.
- ADENs and SSEs at originating/halting stations coordinate for proper placement, watering, and charging of the Track Recording Car.
Officials to Accompany the TRC Run
- Sectional Sr.DEN/DEN, ADEN, and SSE/P.Way (In-charge) accompany the TRC run in their sections.
Frequency of Track Recording
- The frequency of track geometry monitoring by TRC depends on the speed slab:
- Routes above 130 kmph: every 2 months
- Routes above 110 kmph and up to 130 kmph: every 3 months
- Routes above 100 kmph and up to 110 kmph: every 4 months
- Routes up to 100 kmph: every 6 months
Track Geometry Parameters Recorded by TRC
- The Track Recording Cars measure the following track geometry parameters:
- Unevenness of left and right rail
- Alignment of left and right rail
- Twist
- Variation of gauge over nominal gauge (1676 mm for IR)
- Vertical and lateral accelerations on coach floor above bogie pivot
- Curve details (only in contactless laser-based TRCs)
- Speed of recording
Chords for Measurements/Report
- Both types of TRCs can measure and calculate track geometry parameters on two user-selectable chords/bases (short and long).
Frequency of OMS Recording
- The frequency of OMS recording depends on the route speed:
- Routes above 100 kmph: once a month
- Other routes: once every two months
Recording of Defects
- Vertical and lateral acceleration peaks exceeding certain values are considered defects:
- On routes above 110 kmph: greater than 0.15 g
- On other routes: greater than 0.2 g
Classification of Track Quality
- Track quality is classified based on the average total number of peaks per km:
- Very Good: less than 1.0 (above 110 kmph) or less than 1.5 (others)
- Good: 1-2 (above 110 kmph) or 1.5-3.0 (others)
- Average: greater than 2 (above 110 kmph) or greater than 3 (others)
Oscillograph Car
- The Oscillograph Car monitors riding quality of track at maximum sanctioned speed.
- Sectional Sr.DEN/DEN reviews the need for maintenance of track based on OMS recording and other considerations.
Realignment Criteria for Curves
- The running over a curve depends on the difference between actual and designed versine values, and the station-to-station variation of actual versine values.
- The limits of station-to-station variation of versine values depend on the speed of the curve.
This quiz is about the measurement of gauge parameters in Indian Railways, including the types of gauge sensors used and their limitations.
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