Hello, 

Railway engineering can be classified in many ways:

Permanent way engineering

Branch of the railway engineering to develop, maintain and functioning of the permanent way, simply called the track development. This is one kind of basic branch of the railway engineering.

Signal and interlocking engineer

Signal and interlocking engineering as the name suggest deals with the signaling system of the railways, their maintenance, and developments. Similarly, interlocking is to develop the locking and assembling of the tracks.

Carriage and wagon engineer

Engineering branch of the railway engineering, that deals with the carriage and wagons like wheels, axles, SLR coaches, and locomotives.

Electrical and Train lighting engineer

The branch of the railway engineering which deals with the Electrical profile of the railways, either it may be station lighting or it may be a train-lighting.

Jobs under Railway Engineering

There are various jobs present in the Railway engineering head, some of them are as follows:

Senior Section Engineer

Sr. section engineer is the post under railways who looks after the permanent way development, signaling system, wagon wheel etc. the exam is conducted by the railway recruitment boards of various regions. Salary is awesome with other rail benefits.

Train light Engineer

This is a separate and challenging department under the engineering head of the railways, which deals with the train light development and maintenance.Salary is awesome with other rail benefits

Truss Engineer

For the development of the stations and for the building of various superstructures around the bridges, truss engineers are employed to the site. This job offers you the heavy but smart working conditions. Salary is awesome with other rail benefits

Surveyor

Railway engineering works are totally based on the surveys conducted by the surveyors. Thus surveyors in the railways are assigned the tedious tasks and hence are highly paid with other railway facilities.

Junior Engineer

Junior engineer is the common post inside the railways in various heads like Water treatment plant, Permanent way, Signals, and interlocking, etc.

The best opportunity an engineering graduate can get in Indian railways is through Indian Engineering services (IES).Every year an all India level examination(IES) is conducted in the month of june-july by UPSC.

RRB conducts exam for Section Engineer in different engineering branches, there's also Junior Engineer recruitment in various branch of engineering which takes place by RRB. 

Hope, this helps. 

Thank you!