The 'track structure' in Indian railways consists of:
Choose the correct answer
Only rails and wooden sleepers
Rail → elastic clip → rail pad → PSC sleeper → ballast → sub-ballast → subgrade — multiple layers for load transfer
Rail directly on concrete slab without ballast
Rail on steel bridge everywhere
Correct Answer
B. Rail → elastic clip → rail pad → PSC sleeper → ballast → sub-ballast → subgrade — multiple layers for load transfer
Why is this the answer?
Track structure from top: (1) Rail (UIC-60, 60 kg/m — modern; 52 kg/m older); (2) Elastic rail clip (ERC) / spring clip holding rail to sleeper; (3) Rail pad (rubber/EVA between rail and sleeper — vibration absorption); (4) Sleeper (PSC — Pre-stressed Concrete 2.75 m long, 265 kg — now 100% Indian BG; earlier timber); (5) Ballast (crushed granite/limestone, 300 mm thick); (6) Sub-ballast (sand, gravel); (7) Subgrade (earthwork).
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