The following answer is obtained from Internet Research Algorithm :
As you are an Engineer you can apply for technical jobs, which are Group A jobs. These jobs are:
Indian Railways Traffic service
Indian Railways Personnel service
Indian Railways store service
Indian Railways Electrical engineer
Sr. section engineer
Senior P- way supervisor
Chief Depot Material Superintendent
There are 3 ways to enter in Indian railways as an engineer.
Crack IES /ESE within top 50–60 ranks and get first posting as IRSE ( INDIAN RAILWAY SERVICE OF ENGINEERS) or IRSS . which is a plum job as group A central civil servant.
wait for RRB recruitment notification for SSE/ JE Post which is came out zone wise. This group B Post.
If you wrote GATE EXAM then many railway PSUs recruiting through gate score or conduct their own exam. Some of PSUs are RITES, CONCOR, RVNL, IRCON, RAIL TAIL, MVRCL, DMRC, BMRCL, LMRC, JMRC etc.