I am seeing TG 242 which is listed as GO Rail Secure patched to TG 271 which is not listed in the DB so not sure what this is. This is on the Toronto site.
I've also seen 272 which has been a combination of clear P2 and ENC. I think 242 is some sort of Commuter Train Dispatch secure channel since I've seen the locomotive RID's communicate back and forth with the NOC
The RID range of 235xxx below and above RID 223507 are RID's used on the Willowbrook Yard TG of 245 but not sure about the other RID as I haven't seen anything close to the RID.
It might be a talkgroup for the Special Constables to either speak to a train crew, or to Commuter Central in private. It has the same KeyID as the 3xx Enforcement talkgroups (1001) so that would lead me to believe they are related. I just saw a radio switch from the Barrie TG to TG 271 so that would make sense.