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I think I may have spotted a reason for one of the BLI switcher's problems; the fault with the front truck derailing. I dissassembled my undec loco to have a better look and ran some tests: I checked the wheels - in gauge, the truck frame is not twisted (as someone suggested) it sits square on a sheet of glass, the coupler trip pin matches the Kadee height gauge. However, the wire used to connect the truck to the PCB is heavy gauge. Its miles heavier than P2K or Atlas use (for example) and not very flexible - I wonder if this is because the loco will be drawing loads (comparitively) of current due to the sound chip? Anyway - the rear truck wires have suficient room to move around and don't get caught up on anything as there is space inside at the cab end, but the front trucks wires are squeezed in under the speaker. This makes the front truck have a tendancy to push down at the back (up at the front) and therefore derail when running forwards. I will be breaking out the soldering iron and replacing the heavy gauge wire to see if that improves matters. In one of the other threads on the BLI switchers someone said the speaker enclosure is the black box in the cab - well it isn't on mine! The tiny speaker is sqeezed into the hood at the front of the loco, the black box in the cab houses a secondary PCB with the reversing light and cab light LEDs on it. It would be fairly straightforward to remove it and add better cab detail.
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