I'm temporarily banned from the train room (it's okay, some flooring is being installed), so I'm using the time to update/repaint a couple of locos. I'm fairly impressed with the Atlas "Trainmaster" Alco diesels with TMCC and Railsounds, and found two in nearly-new condition a couple of years ago on eBay. I prefer to get a great deal rather than be choosy about roadnames, so I ended up with locos that I'd eventually have to repaint.
Since they're being dismantled anyway, I decided to upgrade the headlights and speakers. I ordered headlight kits from Royztrains.com today, and new Samsung speakers are coming from a distributor in Miami.
Rather than strip all paint from the engines, I just removed the lettering and logos, which is only microns thick, by dabbing on some automotive brake fluid with a cotton swab. After sitting overnight, the painted lettering and logos were soft enough to rub off with clean swabs. Now the engines are a nice, grimy black. The next step will be to apply some Pennsy decals. In hindsight I should have used gloss black as a base coat, since I'll have to spray on some clear gloss where the decals will be applied.
I've been an avid modeler for decades, but these are my first O scale rebuilds. I'm enjoying it, and will post some periodic updates of the two makeovers.