Originally Posted by
jeffpoulin
This is absolutely true. A dozen years ago, I crossed some wet trolley tracks at an oblique angle. I went down so fast, I didn't know what happened. Broke my 5th metacarpal in 3 places and got a slight concussion. Now I only cross tracks perpendicularly and very carefully if they're wet.
Basically same thing as black ice, you go down as if someone has forcefully yanked the bike from under you, no fun, except that studded tires will do squat to help on rails
Adam