Dear Sir,
Each case will be decided by the Courts on the basis of its facts and circumstances under which you have submitted resignation. Your questions are answered below:
whether rejecting technical resigbation for job applied before joining on basis of lack of intimation is right.?
Ans: Yes, you are right to submit your resignation before joining on the basis of lack of intimation.
Can i claim technical resignation with out benefits of past service?on the basis of which rules or court orders?
Ans: It will be decided upon facts of your case read with service rules of railways and settled law of the land, which requires some home work and it cannot be answered in a straight jacket formula.