The steepest tramway with only wheel/rail adhesion was in Montreal (14%), which the replacement buses could not manage in winter.
For reference, this is what a 14% incline looks like. Nothing to sneeze at, note the drastic slowdown and the change in engine sound of the truck.
This is the place to discuss environmentalism, preservation, direct action and anything related to it!
1- Remember the human
2- Link posts should come from a reputable source
3- All opinions are allowed but discussion must be in good faith