This is a job I probably should have carried out earlier in the build. Both engine units have a motor and a set of pickups. What I've done now is wire them together to improve electricity collection.
A pair of the finest wires I have to hand were fitted. They were twisted together and then the pair glued along the inside of the engine units with Loctitie superglue - chosen because it's fairly thick and the pot is fitted with a brush. Glue was splodged in place and the wire pushed into the blob and held for a few seconds with a screwdriver.
The locomotive seems to run better in the test track now. Presumably the pickups weren't the best I've ever fitted and working off 8 wheels instead of 4 was bound to improve matters.
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