As can be seen in a couple of pictures above, the high trestle developed a low spot centered on 1 bent, initial investigations suggested that the dodgy method of skew screwing the support board had failed.
Further investigations revealed that 2 of the 4 screws at the end of the baseboard and one on the bent support had been sheared possibly by something heavy landing on the trestle.
I suspect either next doors moggy or "old poss" the possum using the trestle as a pathway after jumping off the fence.
This has now been repaired so work is scheduled for the low trestle work to recommence.
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The blog has been updated to include descriptions of 2 more locos ( Side Rod and Sugar Cane), these ones have sound cards and motor delay so that the sound "Revs" build before the loco begins to move.
The delay is provided by running the throttle signal through a "Picaxe" microcontroller, sound input passes straight through but motor is delayed.
The sound cards are of a design dating back to the 1970's using discrete IC Shift Registers, these days the same could be achieved by microcontrollers.