Railway Engineering
Track Gauges

Round (called Rollee Holders)
Little Cylinders of Accuracy

Railway gauges are not castings, they are machine lathed accurately using fixed dimension TanTung steel cutters. Each gauge is cut to dimensions that lay your rails at the perfect spacing to give you the best performance on straight and curved track.
These gauges are made of Lucite rod (in colors to identify rail size) so they do not short out the track. The gauges come four in a pack since we've found four to be the minimum number you need to lay track reliably.
For many years it was believed that track needed to be wider in the curves. This was never true. An accurate gauge that lays the rails with the correct spacing, doesn't need to widen in the curves. There is already plenty of room for play.
HO, for instance, is .650 (650 thousandths) and the wheels are .635 so this leaves a full .015 (15 thousandths) for play. A similar situation exists with the other gauges. Hand laid track, when done carefully, can result in far fewer derailment problems.

	||==||	||===||	||====||	||=====||	||======||
	N	Hn3	Sn3	HO	On3

N____ Gauge	Code	40	55	-	-
HO___ Gauge	Code	-	55	70	83
HOn3 Gauge	Code	40	55	70	-
Sn3__ Gauge	Code	-	55	70	83
On2__ Gauge	Code	-	55	70	-
On3__ Gauge	Code	-	55	70	83

Package of Four Rollee Holder Track Gauges Only $19.95