Those who passed the railway entrance examinations with high grade will be appointed in the available vacancies in Railway. The Railways of India come under the Central government. Excellent scale of pay is given to those working in railways. Even though the remuneration is less in the initial stage, with prior experience, they can get promoted to higher grades. They can expect high salaries after promotion.

A candidate must have attained the age of 17 years and must not have attained the age of 21 years.

The exam pattern you can check here:
SCRA exam pattern

It is not much difficult if studied well.
There are approx 42 jobs under it depending upon your qualification as well.

Good luck.