Promotion Enquiry

Dear Sir,

I am K. Prakash. I working as the Group-D (track maintains) employee.

I’ve completed B.E(Computer Engineering). Then I belong to SC caste.

1.       What are the promotion opportunities for my qualification in Indian railways?

2.       And when I can able to write the Departmental Examination ?

Kindly help me sir. I don’t known about all this and am the one and only earning person in my big family? 

Thanks