I also have the SP Daylight ABA set. Still in the box, but I have taken them out to admire them. Never been run. I have given thought to doing an ERR upgrade on them.
Just finished one. Repaint, fixed pilot w/scale coupler, with a Wms plastic FA1 dummy "tender" for more AC pickup and antenna tether. The wiring is different than the typical 3RO diesel - they used some "bus bars" - which I retained. It turned out to be a real PITA. I do not know if you could insulate the body for the TMCC antenna - these things have no plastic in them at all. Also, FWIW, the shells are etched brass, which is pretty cool, but really lacks the detail - and detail depth - of a plastic or die-cast model. I don't mind, personally. Well-geared; a bit noisy, but I kind of like that "brass locomotive growl" aspect. Not too loud. I have not yet put sound in. May not.
(Note that I had forgotten to mount the scale coupler on the fixed pilot here.)
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Testing the ERR functionality of the PA (rear) and the FA. All it had to do was run an inch each way and work the lights for proof. It did. The "bus bar" is on the cloth between the 2 locos. Nice touch at first, but a bit fussy later. I kept it.
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