Central railway not giving posting to the selected candidates since one year .

Sir, we are selected as pharmacist grade-2 in central railway through 04/2014 notification by the rrb mumbai. At the time of application we gave first preference to central railway and second preference to western railway. They selected 42 candidates for central railway and 11 candidates for western railway. They gave posting to 32 candidates in central railway and to all the candidates in western railway. Now in central railway 10 candidates have been waiting since one year for posting. The central railway zone not responding to us. They are telling that there is no vacancy . But we came to know some persons are working on contract basis in central railway and there are 6 vacancies in western railway. But they are telling there is no vacancy in central railway. If there is no vacancy other option is there that there are vacancies in western railway because we gave second preference to the western railway. We have been waiting since one year please help us. Is there any way to proceed legally regarding it and will they give posting to us?