Daniel W

Presumably it's the mass of the original divided by the cube of the scale ratio - so a 20 ton Toad would weigh in at about 46g. The Airfix RTR one I have comes in at 38g. Whether this is enough is opn to question, as a figure of 50g per wagon to get the running right is often quoted.

That's what I assumed Mr Barton. It really brings into question the scaling of Loco power too. I know that a lot of locos are underpowered for their size, presumably more so if scale weight is used on rolling stock.

Also the weight of loads would make a huge difference.