RPF is Railway Protection Force to protect railway passengers, railway property. It is under Ministry of Railways.
As you have asked about the RPF constable Recruitment Guwahati result, let me tell you till now result has not been declared of RPF constable recruitment.
However you can keep an eye on the result from its website, for that
Go to North Eastern Railway website, the page look like




Then click on “Recruitment”, the page open look like




Then click on Recruitment, the new page open look like



Here you will get the information about the result when available.