5 Inch Gauge Track/Wheel Standards
Information extracted from ”Code of Practice” document Appendix 5.
Refer to this document for more details.
| Standard Track Dimensions: | ||
| Imperial (inches) | Metric (mm) | |
| Track Gauge (Nominal) (G) | 5 | 127 |
| Track Gauge (Actual) | 5 | 127 |
| Track Gauge Widening (maximum, where needed) | 5.094 | 129 |
| Check Rail Spacing (CR) | 4.531 | 115 |
| Width of Flangeway (W) | 0.235 | 6.0 |
| Gauge Clearance (G-BB-2*FT) | 0.125 | 3.0 |
| Railhead Edge Radius | 0.02~0.04 | 0.5~1.0 |
| Depth of Flangeway (minimum) | 0.25 | 6.0 |
| Standard Wheel Dimensions: | |||
| Imperial (inches) | Metric (mm) | ||
| Back to Back (BB) | 4.563 | 116.0 | |
| Flange Depth | 0.187 | 5.0 | |
| Flange Thickness (FT) | 0.156 | 4.0 | |
| Flange Angle - Front | 12~20° | 12~20° | |
| Flange Angle - Rear | 0~8° | 0~8° | |
| Wheel Check (BB+FT) | 4.718 | 120.0 | |
| Wheel Root Radius | 0.07 | 1.8 | |
| Wheel Tyre Taper | 1.5~2° | 1.5~2° | |
| Wheel Tyre Width (minimum) | Fine scale | 0.55 | 14 |
| Normal (Preferred) | 0.63 | 16 | |
| Flange Tip Profile | Half round | ||
| Rolling Stock Dimensions: | ||
| Imperial (inches) | Metric (mm) | |
| Coupler Height (above rail) | 31/4 | 82.5 |
| Drawbar X-section (minimum) | 5/8 x 3/16 | 16 x 5 |
| Coupler Pin Diameter (minimum) | 0.25 (1/4) | 6.35 |
| Running Gauge Clearance (minimum) | 3/8 | 10 |
17 June 2009