RPF is Railway protection force. Its duty is to protect railway passengers, railway property and passenger area.
RPF was formed in the year 1957.
AS on 18th Dec, 2015, there is no result for Mumbai RPF constable exam

However you can check the result from the regional railways site.
For that you can follow, below steps

Firstly go to Western region railway website, the page look like




Then click on New, Update and Recruitment, the page open look like




Here you will find the details regarding the result when available.
Contact Information:

Security Helpline (suburban)
1311
Security Helpline (All India)182
SMS complaint number
9004477777