I use "Pink Pearl" Erasers by Dixon.
I cut these to fit into the shoe beneath the car.
Precision is required as if the insert is too thick, traction is lost and the car does not move.
To increase traction, I have added dry weight to the tank as I am not using any fluids.
Considering the size of motor and weight of car, this method  achieves acceptable but not good results.
The carbon buildup on the pads requires frequent changes.
This is a "Fun  Car " and I do not expect efficiency,  Just FUN.
Regards,
BigBee

Can anyone tell me who will be making a "Toronto,Hamilton & Buffalo" Track Inspection Car ?  It was a 1951 Chrysler Windsor Deluxe.
The prototype still Exists. I learned that a company is marketing a model of this unique vehicle in HO  Scale.
Can someone advise me the name of the company ?

Regards,
BigBee in Canada