Consider the following statements about concrete sleepers.1. They improve the track modulus. 2. They have good scrap value. 3. They render transportation easy. 4. They maintain the gauge quite satisfactorily. Of these statements

Railway engineering is a multi-faceted engineering discipline dealing with the design, construction and operation of all types of rail transport systems. (Source: Wikipedia)

Engineering subjects that are part of railway engineering include:

Mechanical engineering.
Command, control & railway signalling. Office systems design. Data center design. SCADA. Etc
Electrical engineering. Energy electrification. Third rail. Etc
Civil engineering. Permanent way engineering.
Light rail systems.
On-track plant.
Rail systems integration.
Train control systems. Cab signalling.