I've used these to kitbash or build several other models of Alco switchers. Makes a good platform for Cary metal body switcher too. Good puller with metal body just insulate electronics. Like other locos of this brand, dirt & humidity can affect performance. Needs clean track to operate well.
When decoder address is changed to 9129 (loco number), the lights don't work. Everything else seems fine (forward, reverse, bell, horn, etc.). Resetting to default address corrects problem with lights.