Yes you can apply..
Q. I have done 4 years B.Tech/B.E. in Electrical/ Electronics, Can I apply for the post of Station Controller/ Train Operator (SC/TO)?
Yes you can apply
DMRC said that B.tech is also eligible for the Junior engineer and Station controller posts, check their FAQ page if you have any doubts http://www.eapplicationonline.com/DMRCHRI2016/Document/FAQ.pdf
DMRC written Test syllabus