Hi, After completing intermediate there are lots of job in the Railway sector. After 12th the SCRA is the best job of Railway board. You can also apply for the clerk post after completing 12th std.
Through after graduation your scope will increase.
Some of the other posts after 12th can be applied are:

• Office helper
• Railway constable
• Railway clerk
• Ticket collector

Also application to these posts are only on the basis of the entrance exam. Good Luck.