This list in not all-inclusive, but rather is a list of the more active frequencies used.

CP Rail
  161.475  CH.1 Montreal Dispatcher
  161.355  CH.xx Yard Channel
  161.175  CH.13 Maintenance of Way
  160.275  CH.59 Yard Frequency
  161.505
  161.115
  161.265
  161.535
  160.425
  160.275
  160.335
  161.325 (ex-Boat Channel?) also CR
  160.725
  160.575

  457.9375 EOT Telemtry
  452.9375 EOT Telemtry


CN
  161.025 Ch.8 Toronto Dispatcher
  161.415 Ch.1 Passenger Train Comm Channel
  161.205 Ch.2 Toronto Dispatcher
  161.425 Yard
  160.935
  160.665
  160.695
  160.485

ETR 
  160.905
  160.605
  160.995 * conflict with US frequency around Amherstburg


CSX
  161.230 *

NS
  160.440 *

* NS and CSX use CN freqs while on CN trackage

Allied/General Chemical
456.6625   (Amherstburg)