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Track & Wheel Standards

Basic Design Dimensions for 5ft 3in gauge

These standards are for Irish 5ft 3in gauge. Use these links for Standard Gauge (4ft 8-1/2in) or GWR Brunel 7ft 0-1/4in broad gauge standards.

The figures have been interpolated from the Standard Gauge dimensions for the purposes of establishing the ScaleSeven Standards for 5ft 3in gauge permanent way, and have been calculated to a high degree of accuracy to ensure that the use of the scale ratio does not introduce undesirable distortions. The difference between Standard Gauge and 5ft 3in is 6-1/2in (3.75mm at 7mm scale).

Acknowledgements to Dennis Mowatt for compiling these standards.

Dimension

Prototype

7mm Equivalent

Prototype

 

Size
(inches)

Exact
(mm)

Rounded
(mm)

Equivalent (inches)

 

 

 

 

 

 

 

1

Track Gauge (min)

63.0

36.75

36.75

63.0

2

Gauge Widening (max)

0.750

0.4375

0.45

0.771

3

Tyre Width

locomotive (nom)

5.500

3.2083

3.21

5.503

wagon and coach (min)

5.00

2.9167

2.90

4.971

4

Back-to-back (max) (Standard dim is 5ft)

60.125

35.073

35.05*

60.086

5

Effective flange

1.125

0.6562

0.68

1.131

6

Back-to-back + effective flange (4+5)

61.250

35.729

35.73*

61.250

7

Check gauge (min)

61.250

35.729

35.73*

61.250

8

Crossing flangeway (min)

1.750

1.0208

1.00

1.714

9

Over check rail faces (max)

59.500

34.708

34.83*

59.709

10

Crossing flangeway – effective flange (8–5)

0.625

0.3646

0.32

0.549

11

Check gauge – (back-to-back+one effective flange) (7–(4+5))

0.000

0.000

0.00

0.000

12

Track gauge – (back-to-back+two effective flanges) (1–(4+(2x5)))

0.625

0.3646

0.34

0.583

13

Back-to-back – over check rail faces (4–9)

0.625

0.3646

0.22

0.377

14

Track gauge + gauge widening – (back-to-back + two effective flanges) ((1+2) – (4+(2x5)))

1.375

0.8021

0.79

1.354

15

Over tyre faces

locomotives

71.125

41.4478

41.42 (min)

71.006 (min)

wagon and coach

70.125

40.8645

40.85

70.029

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