thanks, guys, have checked, back to back, seems about right, and it belts along the straights, and Hornby, large curves. I think, it sulks, when faced with the prospect of sitting in a siding. Trouble is, removing it, requires a planned operation, and these lifting boxes, aint cheap. Will look at peco large radius, cos i have a Rivarossi, Big Boy, and a challenger, that may be just as touchy.