Railway RRB / NTPC

A pantograph is a mechanical device that maintains contact with the overhead electrical wire to supply power to electric locomotives and trains.

Indian Railways primarily use 1676 mm broad gauge, which is the widest gauge in the world and allows for higher speeds and greater stability.

The traction motor converts electrical energy into mechanical energy to drive the locomotive wheels through the transmission system.

A yellow signal indicates 'caution' - the driver should prepare to stop at the next signal as it may show 'stop' indication.

Ballast, typically made of crushed stone or gravel, supports the sleepers and distributes the train's weight evenly to the subgrade.

The diesel engine is the primary component that converts the chemical energy stored in diesel fuel into mechanical energy through combustion.

A 'rake' is a complete formation of railway coaches or wagons that are coupled together to form a train unit.

Buffers are spring-loaded devices that absorb shocks and minimize damage during coupling and uncoupling of railway carriages.

Indian railways predominantly use broad gauge (1676 mm) which covers approximately 43,000 km of the total network.

A red signal in railway signaling is a mandatory stop signal indicating that trains must not proceed beyond that point.