This subject has come up before and yes, it can be done. I just wanted to share the work I did on my Atlas O scale Texas & Pacific SW9. I removed the conventional Dallee electronics and installed a TAS SAW board with a custom smoke unit. It was a lot of work but it all fits and no modifications were done to the drive assembly. I know TAS did make boards to fit the SW8/9’s but we all know they’re far gone by now. I could’ve installed an ERR board but hey, I had this laying around and wanted to try it out. Take a look and tell me what you think. I’ll upload a video of the assembled unit after I’m done with the trim details.