Only they don't want it to sound like one tiny leaf can physically stop something the size of a train, so it's down to the leaves making the tracks slippy... adhesion between the track and the wheels I think, not the track and the ground.
Paul Clarke's blog - I live in A small town. Wed to Clare + father to 2, I'm a full-stack web engineer, + I do mostly js / nodejs, some ruby, python, php ect ect. I like pubs, running, eating, home automation and other diy jiggery-pokery, history, genealogy, TV, squirrels, pirates, lego, and TIME TRAVEL.