Radio frequencies - Trains Magazine

I'm sure that this is the sort of question that attorneys would object to as having been "asked and answered" (probably several times), but I'll ask it anyway. What is the range of radio frequencies used in US/North American railroading voice communications, etc.?

By piecing together information from various articles (in Trains magazine), I've been able to document that AAR channel 9 is at 160.245mHz and AAR channel 96 is at 161.550mHz, with everything in between falling nicely into 0.015mHz steps by AAR channel number. If I extrapolate back down to where "channel 1" would be, that calculates out to be 160.125mHz. "Channel 1" seems to be as good a starting point as any, but what's the highest channel number (and frequency) in use nowadays?

Thanks (in advance) for any information,

Alan
Evergreen Park, IL