5 Inch Gauge Track/Wheel Standards

Information extracted from ”Code of Practice” document Appendix 5.
Refer to this document for more details.

5in Gauge profiles

 

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