I am going to build two 2x6 foot TOMA modules. I am inspired by Joe's September Publisher's Musings where he showed this:

I rarely run with DC train control. Yes, certainly in bench testing and on a test loop I will exercise DC models, but my focus is on DCC control, for the most part. Recently, I had an impassioned request for help with block detection on a DC layout, with a specific request to use the “venerable” Twin-T detector circuit. It led me down a path that I did not expect, and to this report, that may be of interest to modelers

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I got a brand new Athearn Genesis GP9 Rio Grande Phase II 5913 (G62459), in DC.
I tested it in DC and it worked beautifully.
I converted it to DCC using a Tsunami 2, that was no problem, I've done that before many times.

A few days later as I was done weathering it and I put the shell back, I noticed the engine squeaking when I ran it on my test track. I isolated the squeaking issue to be in the motor/flywheel assembly, here's a video showing it clearly:

Based on the material posted in this blog I put together a slideshow/talk and have had the pleasure and the privilege to share it at model railroad conferences and conventions over the past 14 months.