Railways exams

It's not necessary. It totally depends on the recruiters whether they take you or not.

Government exams and the IT certifications you mentioned are different things. Understand the fact that government exams are aptitude based. You will have to prepare Maths, English and reasoning.
If you are preparing for government exams and in your spare time you think of doing these certifications then go for it. But, if you think that your certifications will help you in exams then it's a wrong notion.
Yes, you can go for government exams till the time you are eligible for them.

It is must for any government. Job or government colleges.

Yes, distance education is valid for government jobs. For government jobs, selection process is same. So, no partiality is possible. Where only written exams are conducted, you can be rest assured that you are treated like any other regular degree candidates.

Yes, it's degree is valid, as it is a national University.

Kindly visit this link:
https://www.rrbrecruitment.co.in/rpf-admit-card/

There are some vacancies that are solely released for O level certificate holders. Keep an eye out for them. Also, some jobs give preference to O level holders like UPP, UPSRTC, etc.

Railway Recruitment Board is all set to conduct the RRB JE 2019 Exam.
The board has recently announced 13487 RRB JE vacancies.
Candidates who are interested to appear in this exam should not down the important dates as given here -
The online registration process has been started on 2nd January 2019 and will end on 31st January 2019.
The exam will be conducted in April/May 2019.
Candidates can apply for this post from - https://scoop.eduncle.com/rrb-online-registration-form here.
Hurry up!
You got a very short period to submit the application form.
If you need any further information about the RRB JE Exam, feel free to ask!
Best of luck!

There is no official notification about the recruitment of RRB SSE and JE from till now, based on the previous year exam date, it will be held in month of August or September.

Its essential for every aspirant to fulfil the eligibility criteria for appearing in competitive exams conducted by RRB. RRB (Railway Recruitment Board) is one of the most popular competitive exam conducting body which recruits many of aspirants in vacant posts of railway. Recently RRB has announced the notification for conducting RRB Group D 2018 Exam. As per the recruitment notification, there are 62907 vacant posts for group D in railway.
So, I hope the provided information will be helpful to you!
Best of luck!