National Association of S Gaugers

Standard RP3: Track - Proto:64

S3 Standard

Standards and Clearance Diagrams

Track and Wheel Standards - NASG/NMRA standards
- Track, Standard Gauge S 3
- Track, Narrow Gauge S 3.5
- Wheels, Standard Gauge S 4
- Wheels, Narrow Gauge S 4.5
- Track, Proto: 64 RP 3
- Wheels, Proto: 64 RP 4
- The NASG Clearinghouse offers track and wheel gauges for S standard gauge.
NMRA Standards
- standard-gauge NMRA turnout dimensions (RP 12.3)
- The NMRA recommended practice for car weight is 2 oz. plus another 1/2 oz. per inch of car length.
- Sn3 track and wheel gauges are available from the NMRA.
Clearance Diagrams and Gauges
- older (pre-stack car era) clearance template (PDF)
- newer " Plate H" clearance template (PDF)
- If you prefer to purchase a clearance gauge instead of making one, S clearance gauges are available from banta modelworks made of either wood or acrylic.