Railways

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Check your mail and SMS. You will get it there. Emails never get deleted. Please check there.

You can pursue distance/correspondence course from a recognized institute. All such degrees are considered equivalent for the government exams.

There are no special colleges for Indian railways.

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

Yes, there is a good scope in Fire and Safety Engineering. Employment areas in fire and safety engineering are:-Aircraft Industry, Airports, Chemicals Plants, Construction Companies, Defence Forces, Electricity Boards, Fertilizers, Fire Departments of Local Government Bodies, Fire Equipment Manufacturers, Industrial Processing LPG and LNG Handling and Bottling Plants, Municipal Corporations, Oil Firms, Petrochemicals and Plastic Industry, Petroleum Refineries, Railways, Textiles Industries etc. All the best.

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.