lol.
I was actually watching a vid of the zig zag railway the other day, it showed one of the bb18's on a freight sitting in the middle road waiting to get into the top points, when the DD17 at the station got out onto the top section, of course a greenie was given to the BB, poor driver couldn't get traction, so he released the brakes and flew down the grade to get a run-up. Did You Know that steam locos were designed to have bad traction on purpose, eg. A BB18's tractive force at 85% B.P. is 22648 lbs, where as a disel or electrics tractive effort would be 10 times better than this.
Know why? Beacause any better tractive effort than that 22648 lbs, and you would start to bend and break things eg. Rods, Pistons cylinders, etc.
The expert has spoken.
Just kidding I'm no expert, got a lot to learn yet eg. Lubricators, westinghouse pumps and how to fire a loco properley (not the hillbilly way)....