You might try this website to get the information you are requesting about online registration for the RRB SSE Exam: https://scoop.eduncle.com/rrb-online-registration-form
This website seems to have a lot of information which may be of assistance to you. I wish you all the best in your educational endeavors Karan.
You can get exam date & payment related details from below link :
For Exam Pattern & syllabus please check :