To obtain reliable running from your models,the wheels must be accurately spaced. This gauge will enable you to correct badly adjusted wheels, without other special tools. To operate rolling stock with varying wheel standards on the same track, the wheels need to be carefully set to match the type of track in use. Therefore each type will need its own gauge. Use the correct gauge made especially for your particular models.
Railway wheel guiding action is quite complex in operation.
On straight track, the function of the flanges is easily seen, but the action over point-work is less obvious. The most important dimension of a wheel- set is the distance from one flange back to the opposing wheel's flange front or face. If all wheel sets conform to a suitable standard, trouble free operation will be achieved. Fortunately, track and pointwork from the various manufacturers from Europe, the USA and England conforms to an acceptable degree, including the latest small profile rail. The deeper flanges of some older models will touch the rail fastenings of these tracks, however.