idlemarvel
Neither idle nor a marvel

Be wary of 0-8-0 on R1 curves it runs in theory but in practice as it is a straight chassis with all flanged wheels it grinds around R1 and takes a lot of volts to make it start on R1. 2-6-2 is fine on R1. Don't even consider 2-10-2 on R1 it looks ridiculous. The 0-10-0 chassis is articulated so Saxon VIK looks and runs okay as do any Bo-Bo or 0-4-4-0 locos as long as you allow for the overhang.