Chuck, two of the videos or files are not there, but the first one was pretty impressive. I have never gotten an AC motored unit to do that, not bad at all! 
I would have liked to see how you were manipulating the Legacy controller, it seemed like the prime mover sounds were pretty active before the locomotive started moving. 
Here is the second video
Here is the third
I had one video going with the controller in the frame but something else went wrong. I was looking for my Jobi mini tripod but I think it's at work. Between manipulating the camera and the CAB-2 I had my hands full. The open frame motor does suck up more power to get moving and the RS board's behavior reflects that. The best way to start one of these up is to load the train brake and then dial up the power to near where you want and then slowly release the train brake.
If you really want to see an open frame unit crawl use a TPC. The pulsed power and 72 steps allows the engine to move pretty well even at low speeds.
The files were there, there is an issue with the editor and the mac and more than one video in a post. I even tried editing raw html and it still was coming back with "file not found" yet I could copy and paste the path into a new browser window and get playback.
Well, you have to work at it, but that's pretty good results with AC motors.
I'll still take the can motors and cruise control for sustained running, makes it easier to keep multiple trains on the same track running smoothly.
I get the sense that the OP isn't getting the same performance, hence this thread.
S2 has a large horizontal can motor with large flywheel and Odyssey control. Great engine, only drawback is the diecast shell makes it top heavy. With the CAB 2 it runs beautifully under TMCC control.
That F-3 has two Pullmor motors, as gunrunnerjohn notes. Pullmors generally run smoother and smoother (and capable of lower speeds) as they get more and more broken in. Perhaps yours don't have much run time on them.
Another major improvement in TMCC Pullmor low speed operation frequently comes when they are operated with the Legacy system. If you have a chance to run them with a Legacy system, try it. The difference in low speed operation can be quite significant.
Running mine (Southern ABA & TX Spec AB) with the Legacy system and the performance is still 2 speeds -stopped and fast.
Does the Texas Special F3 (6-38100) have a spot for the 9 volt battery compartment? The B unit has 2 screws (1 on each door at each end) so is that the location to put in the 9 volt battery?
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