2.5 Maintenance
Coaching Maintenance Depots.
According to number of based coaches (holding Capacity), depot is classified into three categories.
Sr. No Depot Number of based coaches
1 Minor 50 to 100
2 Medium 100 to 250
3 Major Above 250
1. Pit line for examination and repairs of coaches
2. Sick line with covered accommodation
3. Office & store facilities
4. Machinery & plants
Length of track under covered accommodation for any type of sick line must be at least 4% of the holdings of the depot (based coaches). The working space required for each coach is 35 m. Track length should not be less then 140m for any type of sick line.
It is essential to provide 50% track length under a covered area with pit examination facilities with proper light arrangement inside the pit. The pit also is ensured that it is provided with drainage facilities with 1% inclination & required number of man holes. Electric hoist of capacity 3 to 5 tonnes should be made available to cover the sick line across the track.
The width of the covered accommodation should be normally 15 meters covering two tracks under it. The distance between two centre lines of tracks should not be less than 7.5 meters. It should be ensured that proper space is provided beside the track for free and easy movement of transport vehicles like fork lift, lustre truck, trolleys, truck, etc.
Entire covered accommodation must have adequate lighting arrangement for workers to work without eye strain.
Machinery and Plant: To avoid heavy manual labour, wastage of manpower and to provide efficient working environment in depot, suitable adequate machinery and plant is required as under:
Synchronised whiting jacks, Coach shunter, Welding plant 200 amp capacity, Gas cutting & welding equipment, Vacuum exhauster, Air compressor (350cfm), 2 tones tram beam hoist, Sewing machine, Light Commercial Vehicle, Wood cutting saw 37 machine, Forklifts, Hand shearing machine, Portable furnace, Centre lathe, Wheel lathe, Manipulator/fixture for bogie, Ultrasonic testing apparatus, Tool post grinder.
TOOLS:
a) Pneumatic hand tools
i) Grinder,
ii) Drill,
iii) Chipper/buster,
iv) Riveter
b) Electric power tools.
i) Pop riveting tool gun,
ii) Drill,
iii) Bolt tighter/torque wrench. Hand tools including torque wrenches as required.
c) Test benches and miscellaneous items.
i) Single Car test rig
ii) DV Test bench
iii) Air Brake cylinder overhauling test bench
iv) Water tank test rig.
Primary Depot and Secondary Depot Sl. No Primary Depot Secondary Depot
Maintenance Schedules to be followed in Coaching Depots
Schedule is a work which is to be carried out at a prescribed interval of time. Schedule attention is required to keep the rolling stock in good serviceable condition without any failures during its life cycle for effective utilisation.
The different schedules that are carried on the primarily maintained coaching stock are:
a) Trip Schedule : After every trip
b) ‘A’ Schedule : 1 month +- 3 days
c) ‘B’ Schedule : 3 months +- 7 days
d) Intermediate overhaul (IOH) : 9 months + 30 days
e) Periodical overhaul (POH) : Once in 18 months (After 24 months for newly built)
f) Special Schedule : As prescribed by each railway
Primary maintenance schedules are required to be carried out by the base depots to which coaches are allotted. In emergency, due to any reason if the coaches cannot reach their base depots and schedules become due, A & B schedules should be undertaken by the Coaching depot where the coaches are available.
