Class 465/9 Speed Set?

Does the Class 465/9 Speed set knob work or is it just for show?

 

It does work.
You need regen braking switched on and the throttle in position 4 for it to work.
When it's activated, a blue line will show up around the HUD.

 

It does work but like the real train you have to have the "Regen Brake" turned on and the power handle has to be in notch 4, just press this button in the picture below

 

Thank you both