The Canadian standard is 30 metres from edge of the property line shared with the rail corridor, with caveats:
1. Can be reduced by a crash wall (typically by 5m)
2. Can be measured horizontally and vertically
3. "low occupancy space" can be constructed within these areas - i.e. parking, storage areas, etc.
View attachment 686905
This is the full guideline for details. There are further nuances to it than that, but that's the general idea.
In the case of 6 Dawes, they built a crash wall, which reduced it to 25 metres, then filled that 25 metre area basically entirely with low-occupancy space (i.e. parking) until they got 25 metres up vertically, where the units start.