A treadle bar serves the purpose of_____________________?
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Answer: A. interlocking points and signal
Explanation
A treadle bar is a mechanical track device used in signaling and interlocking systems to prevent point movement when a train is passing. The physical presence of train wheels depresses the treadle bar, mechanically locking points against accidental movement. This safety interlock mechanism protects moving trains from derailment during switching operations at station yards. Railway signaling and interlocking systems are designed to ensure safe train routing through complex station layouts. Treadle bars operate alongside mechanical switch points to detect train presence directly on the running rail. Modern electrical track circuits have largely replaced mechanical treadle bars in contemporary automated signaling networks.
Setting points and crossings is performed by switch levers and point machines rather than safety treadle bars. Marshalling yard signals guide train shunting movements but do not serve the specific point-locking function of treadles. Track maintenance activities involve ballasting and tamping equipment rather than specialized interlocking treadle devices.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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