Smaller diameter drivers will give you a somewhat slower speed OK, but be careful about that. On a locomotive with connecting rods between the drivers on different axles, and two drivers tight on each axle each driver must be exactly the same diameter or binding and slipping will occur. as far as the size of the drivers look at full scale practice. Engines designed for slow freight hauling had small drivers for more torque and less speed, while the fast locomotives for express passenger service had large diameter drivers. Look at it this way, you boiler can fill the cylinder so many times a minute and that sets the speed the cylinder and piston make a stroke. Then at each full stroke the engine moves a distance of the circumference of the driver. In effect the smaller driver is putting the engine in a lower gear. And you can see what would happen if your drivers were not all the same diameter as close as you can get them as otherwise one wheel would want to go further down the track than the wheel on the other end of the axle or a wheel coupled to the first wheel with rods. In my own opinion that is one reason the Shays etc are so popular now. With the gearing the engine part is going as fast as it can while the wheels go slower and at a more constant speed. Now all this is only my own opinion and it is worth every cent you paid. I already made one mistake today; I got up out of bed.
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