See this kind of things are usually decided by the RRB. But if you are sure about your eligibility conditions then I would recommend you to contact the helpdesk of the RRB and get it clarified. They will provide you the appropriate explanation. Such kind of things can only be specifically available from them only as they have all the details in there server. So better to contact them.

For the RRB Secundrabad contact details, visit the link below:

https://rrbsecunderabad.nic.in/contacts.html

I hope this answer helps. All the very best for your future endeavors!