Welcome on board another David. Yes they can be made to go superbly as I found out just after we had completed the Tiverton Track. Not sure of the regulator as a friend has problems with his in Reading. Also the cylinder porting as found on all their models.
David and Lily Reading.
Builder of far too many projects, but I love them all. The more Locomotives you have building, the more solutions to other Projects Problems get Solved. Reworking Simplex into a Fowler Complex. Making a Jinty more to scale. And going up a size in the shape of a Jessie.