There are some important precautions that must be taken when installing DCC decoders in Micro-Trains’s SW1500s.
The MTL SW1500s were welcome additions to the N Scale world. Despite their too-wide hoods, they fill a huge gap in available diesels. Even better: despite using the DCC un-friendly Life-Like designed SW1200 mechanisms, they’ve been upgraded to be able to accept a “plug and play” decoder.
There’s only one small problem: as they arrive, they require lots of additional insulation to prevent short circuits that will blow up decoders.
Next turn your attention to the frame halves. Everywhere where things might touch should be insulated. This may be over-kill, but better safe than sorry.