Railfan communications

I have both Amateur (ham) and GMRS licenses and often carry a handheld radio (HT) when railfanning. There are no established frequencies for radio communications. But these are my suggestions if you're chasing in a group:

Amateur: 146.490  MHz
                  147.540 MHz

GMRS: Channel 4 - 462.6375 MHz. This channel is available on both GMRS and the low power FRS radios. Danny Harman (Distant Signals on YouTube) has mentioned it is active in his area of Florida. 

GMRS: Channel 16 - 462.5750 is used by many Off-Road groups (Channel 16 is 4x4...)

I prefer to use a dedicated scanner whenever possible. I do, however, program a few of the more active Road Channels in my radios. Just in case.

Programming all the AAR frequencies in your HT is a chore. But if your radio is supported by CHIRP it's a breeze to import them.