I was testing TMCC with CC-M installed Century Club Niagara engine in TMCC mode with CAB-1L, and came across an operational sequence that I didn't know existed, and I didn't find in the CAB-1L manual I have.
I am used to the operation of hold Brake button to slow or stop, when you release Brake button, engine goes back to speed before Brake was used.
However, I found that if I used the Brake, then, as soon as I released the Brake, I turned the Red Speed Knob counterclockwise bit, the engine would hold the Braked speed - not return to the pre-Braked speed. So if you Brake to dead stop, release Brake button, turn Speed Knob counterclockwise a bit, engine remains at dead stop. If you Brake to half the speed you were going, release Brake button, turn Speed Knob counterclockwise a bit, engine remains at half speed.
I assume that the Speed Knob counterclockwise a bit overrides the return to pre-Brake speed within the CAB-1L programming.
Don't know if same would hold true for the older CAB-1.