"Ian Johnston" wrote in message
...
3000hp at 100mph is pretty close to 5 tons of thrust. As David says,
compared to the crash forces on half a train (4 * 35 ton coaches + 1 *
70 ton locomotive = 210 tons), that's trivial.

Actually it's even more trivial than that, because the power car's engine
only produces 2250hp, of which (according to a general rule of thumb for
diesel locos) only about 80% would be available for traction even if not
providing ETS. So we are probably looking at 1600-1800hp available for
traction, depending on the ETS load, reducing the calculated thrust to
around 3 tons.

That's still higher than my guess yesterday (2 tons), but that was just a
guess which I thought afterwards might have been a bit on the low side.

Roger