1.is any other ways to join police job ,without any problem.
If the railways speak the rue of NOC, you have to accept it so there is no harm in it. Moreover the employment with railways was for very short period hence there is no impact about this even if you reveal or suppress the information with police department.
2 in case i resigne railway then i join police whate leagle action will they take ?
No legal action for this. It is your right to opt for whatever job you feel it to be better
3please tell me weither i join new job or stay with parent job.,
You may analyse the pros and cons of oth the job and decide, nobody can advise on either of the options.
4 in case i join police job ,without noc of railway ,in future if i got any other job with noc of police deportment ,is there any problem to that new job.
Subsequent NOC from police department will protect your future employment interests.