Hi LIst, Our tracks are defined by the gauges and we have a well established standard for the wheels but what is the clearance between wheels/rails for each gauge in order to have a good, smooth running? Is it different for a straight/curved portion of a track? That's all for today. Thanks. Pierre pierre.courbouleix@xxxxxxxxxx MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.