I modeled up the alternative battery box which had the peaked roof rather than just a flat top. I also completed the second chassis, which had a couple of little modifications over the first version. This time I added the spring tags onto the High Level hornblocks and added supports for a length of sprung steel wire. The result is that the axles are now properly  sprung. As the sprung wire connects electrically to the hornblocks and the wheels I used it to feed power up to the motor. I've also managed to finish the coupling rods on this one, fixing the crank pins in place and covering them with the 3d printed covers.

This locomotive has a wheelbase of only 32mm and an overall length of 90mm. I plan to use some thin solder to make the wires from the connector into  battery box and the control console.

I'll reprint the chassis for the first loco and complete the pair.

David