What are the frequencies for the Framingham yard and what is the volume of traffic that goes through Framingham?
Channel one for the road(46/46), channels 2 (64/64) and 3 (50/50) for yard jobs. I'm sorry but I forget the numbers that you would need for scanner.
traffic can be pretty sporatic. Since I am assuming you will be going ther by MBTA, stay at the station platform (or close to it) as to not trespass, also you can see almost any action from here.