https://www.msn.com/en-ca/news/canada/metrolinx-says-e-bike-batteries-that-dont-meet-standards-wont-be-allowed-on-trains/ar-BB1jUwAm
I regularly take the train out of the city, and do day rides back.
Luckily, when an inspector rolls around, I'll be in the clear (I double checked), but I think...