hii asad ,
If you want to get a job in Indian Railway then the very first thing to do is to check your RRB exam eligibilty to check whether you are eligible or not.
After checking eligibility you can start your preparation according to the post relesed by RRB.
Indian railway is best platform for start your career as it provide many job vacancy . It gives secure job to workers.
Many jobs are aviliable under Indian railway , after 12th you are eligible for group c or d post.
Hope I resolved your query.
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