All this talk about relative pulling power makes one wonder how to go about making a (model of a) dynamometer car ! ?

mmm , dynamometer car , next NGS ready to run maybe ?

Wot, no Deltic? I'd pick that over the 25 (which is nice enough but the grab-handles on the front look way too big, and though it runs fine mine makes a slightly annoying gronking sound). The Deltic glides smoothly everywhere it goes.

The Deltic has a host of compromises on the bogies which (whilst necessary) do take away a bit. In fact, the wheel diameter used is smaller than that on the old Farish Deltic....and the old Farish deltic wheels were undersize!

Nice enough model, but others are better IMHO.

Cheers,
Alan