This gauge set is designed to make it painless to lay parallel tracks, evenly spaced yards, and concentric curves. The space between the uprights is designed to accept a 1/4 x 1.5 x 36 inch yardstick, or similarly sized meter stick, of the heavier sort you can find at home improvement stores, typically for under $1.00 US.
For a temporary jig, use a rubber band under the hooks to keep the gauge on the yardstick. The notch on top allows you to see the markings on the yardstick for precise positioning.
For more permanent positioning you can drill your yardstick and use a 1/8" machine screw to attach it so that it doesn't slide around - Ideal for creating a standards gauge for modular railroad systems like N-Trak or BeNdTrack. With this set you can make a jig to position tracks for a large yard, or assure proper spacing at the end of a module. The base of the jig is sized so that you can put tracks no closer than the NMRA recommended minimum spacing... though most people allow a bit more than that. You can also run a piece of 1/8 in. rod through the holes and space several tools out to be sure you're laying your track in a straight line.
Also included are a pen holder that will handle anything from an ordinary pencil through a Sharpie marker; and a trammel point sized to fit the same yardstick, that puts the pivot right at the end, instead of offset so that you have to remember to add an inch to your figures when setting the radius of a curve.
The TrackToolz set is offered in Z, N, HO, and S gauges as well as individual parts. See below for links to those pages.
Z Gauge TrackToolz
N Gauge TrackToolz
HO Gauge TrackToolz
S Gauge TrackToolz
Z Track Gauge
N Track Gauge
HO Track Gauge
S Track Gauge
Track Spacers (33mm - TTrak) 2-2 track, 1-3 track, 1-4 track
Track Spacers (1.5" inch - NTrak and others) 2-2 track, 1-3 track, 1-4 track