The mechanical device which transfer chemical energy of fuel into mechanical energy in the form of motion is called:

The sinuous path taken by an engine as against the alignment of the track is known as:

While preparing sub-grade of a railway line, the grubbing operation means:

The section of a rail is decided on the basis of:

Ballast best suited to steel sleepers is:

The phenomenon of misalignment of rails due to temperature change is known as: