I've seen requests on some lists for information about AMTRAK police operations and frequencies. A search of the Internet turns up little information, but I decided to try and piece together as much of it as I could. I think I saw a thread on AMTRAK police on the SCAN-DC list a while back. The frequencies of 173.3500 MHz and 173.3750 MHz came up, and someone pointed to an archived edition of the Capitol Hill Monitors newsletter that has some great info on the AMTRAK police radio channels: http://henney.com/chm/0299/.
Other web sites have indicated that the AMTRAK police in New York City may have additional channels besides the ones listed in the previous link: F2-160.8150 MHz, F3-161.2950 MHz, F4-161.2050 MHz, F5-161.2950 MHz, F6-161.2050 MHz. 161.3650 MHz is also listed in some sources as an AMTRAK police frequency. These are all channels in the standard US railroad allocations, so in theory they may be using any of the 99 available VHF channels. The 173.3500 and 173.3750 MHz frequencies are not exclusive federal allocations, so you may hear other users on these channels.
Here on location, I have been hearing what appears to the AMTRAK police operations on 161.2950 MHz, 131.8pl. There have been a few incidents over the last few days at Penn Station involving NYFD units, but nothing that seems to have made the news.
Got any confirmed AMTRAK police frequencies you want to pass along? Send them to the Fed Files and Monitoring Times!