Table key:
R = radius of turnout curve
L = lead from toe to nose
A = length of straight
Prototype pre-nationalisation bullhead track turnout data
by Brian Oldford and Keith Norgrove
| Switch | Crossing | GWR | LMS | LNER | LPTB | SR | ||||||||||
| R | L | A | R | L | A | R | L | A | R | L | A | R | L | A | ||
| A | 4 | 130' | 42' 10 25/32" | 130' | 42' 10 3/4" | 130' | 42' 10 3/4" | |||||||||
| 4 1/2 | 168' | 45' 1" | 168' | 45' 1" | 168' | 45' 1" | ||||||||||
| 5 | 212' | 47' 1 3/4" | 212' | 47' 1 3/4" | 212' | 47' 1 3/4" | 212' | 46' 11 1/2" | ||||||||
| 5 1/2 | 264' | 49' 1 13/32" | 264' | 49' 1 1/2" | 264' | 49' 1 1/2" | 264' | 49' 0" | ||||||||
| 6 | 326' | 50' 11 13/16" | 310' | 50' 7" | 1' 0 1/2" | 326' | 50' 7" | 326' | 50' 11 1/4" | |||||||
| 6 1/2 | 398' | 52' 9 3/16" | 398' | 52' 9 1/4" | 398' | 52' 9 1/4" | 398' | 52' 9 1/2" | ||||||||
| 7 | 482' | 54' 5" | 482' | 54' 5" | 482' | 54' 5" | 482' | 54' 5" | ||||||||
| 7 1/2 | 482' | 54' 7 7/8" | 4' 9 11/16" | 482' | 54' 8 1/4" | 482' | 54' 7 3/4" | 4' 9 11/16" | 579' | 56' 1" | ||||||
| 8 | 482' | 55' 1 5/32" | 9' 2 15/16" | 482' | 55' 1 1/2" | 482' | 55' 1 1/2" | 9' 2 15/16" | 694' | 57' 8 1/4" | ||||||
| B | 6 | 310' | 58' 1" | 312' | 57' 1 1/32" | 312' | 57' 1" | 312' | 57' 1" | 313' | 56' 9 1/8" | |||||
| 6 1/4 | 340' | 59' 2 3/4" | ||||||||||||||
| 6 1/2 | 371' | 60' 3 1/4" | 374' | 59' 2 3/4" | 374' | 59' 2 1/2" | 374' | 59' 2 1/2" | 375' | 58' 11 7/8" | ||||||
| 6 3/4 | 405' | 61' 4 5/8" | ||||||||||||||
| 7 | 439' | 62' 5 5/8" | 445' | 61' 3 3/32" | 422' | 60' 7 3/4" | 445' | 61' 3" | 445' | 61' 1 1/2" | ||||||
| 7 1/4 | 478' | 63' 5 7/8" | ||||||||||||||
| 7 1/2 | 516' | 64' 6 1/4" | 524' | 63' 2 21/32" | 524' | 63' 2 3/4" | 524' | 63' 2 3/4" | 524' | 63' 1 3/4" | ||||||
| 7 3/4 | 560' | 65' 6 1/4" | ||||||||||||||
| 8 | 603' | 66' 6" | 613' | 65' 1 3/8" | 613' | 65' 1 1/2" | 613' | 65' 1 1/2" | 612' | 65' 1 1/2" | ||||||
| 8 1/4 | 652' | 67' 5 1/2" | ||||||||||||||
| 8 1/2 | 702' | 68' 5" | 613' | 65' 3 3/16" | 4' 8 5/8" | 713' | 66' 11 3/4" | |||||||||
| 9 | 613' | 65' 8 11/32" | 9' 1 1/2" | 613' | 65' 8 1/4" | 9' 8" | 613' | 65' 8 1/4" | 9' 1 1/4" | 826' | 68' 9 1/2" | |||||
| 10 | 613' | 67' 1 25/32" | 17' 3 5/32" | 613' | 67' 1 3/4" | 17' 10 3/4" | 613' | 67' 1 3/4" | 17' 3 3/4" | 1101' | 72' 2 7/8" | |||||
| 11 | 613' | 69' 2 1/4" | 24' 8 7/16" | 613' | 69' 2 1/4" | 24' 10 1/4" | ||||||||||
| C | 7 | 416' | 69' 3 13/16" | 416' | 69' 3 3/4" | 415' | 69' 5 1/2" | |||||||||
| 7 1/2 | 485' | 71' 6 3/32" | 485' | 71' 6" | 485' | 71' 7 3/4" | ||||||||||
| 8 | 558' | 74' 11 1'4" | 562' | 73' 7 1/2" | 562' | 73' 7 1/2" | 561' | 73' 9 1/2" | 563' | 73' 5 1/2" | ||||||
| 8 1/4 | 598' | 76' 0 1/8" | ||||||||||||||
| 8 1/2 | 641' | 77' 1" | 647' | 75' 7 5/8" | 647' | 75' 6 3/4" | ||||||||||
| 8 3/4 | 686' | 78' 1 1'2" | ||||||||||||||
| 9 | 732' | 79' 2" | 740' | 77' 7 15/16" | 740' | 77' 8" | 740' | 77'8" | 740' | 77' 7 1/4" | ||||||
| 9 1/2 | 832' | 81' 2 1/8" | 844' | 79' 7 1/8" | 842' | 79' 6 3/4" | ||||||||||
| 10 | 942' | 83' 1 5/8" | 960' | 81' 5" | 955' | 81' 6 1/4" | 960' | 81' 5" | 960' | 81' 5" | ||||||
| 10 1/2 | 1062' | 85' 0 1/2" | 960' | 81' 7 11/32" | 4' 6 21/32" | 1082' | 83' 3 1/8" | |||||||||
| 11 | 960' | 81' 11 1/2" | 9' 0 17/32" | 918' | 81' 6 1/4" | 10' 5 1/2" | 960' | 81' 11 1/2" | 9' 0 17/32" | 1219' | 85' 0 7/8" | |||||
| 12 | 960' | 83' 2 11/32" | 17' 5 9/16" | 960' | 83' 2 1/4" | 18' 2 1/2" | 960' | 83' 2 1/2" | 17' 5 9/16" | 1541' | 88' 6 1/4" | |||||
| 14 | 960' | 85' 4 3/4" | 32' 8" | 960' | 87' 1 3/4" | 32' 8 3/4" | 2440' | 94' 10 5/8" | ||||||||
| D | 8 | 545' | 80' 6 3/16" | 545' | 80' 6 1/4" | 545' | 80' 6 1/4" | 544' | 80' 5 3/4" | |||||||
| 9 | 707' | 85' 2" | 707' | 85' 2" | 707' | 85' 2" | 705' | 85' 1 5/8" | ||||||||
| 10 | 868' | 93' 6 3/8" | 896' | 89' 6 29/32" | 876' | 89' 1 3/4" | 10 1/2" | 896' | 89' 6 3/42 | 893' | 89' 8 1/2" | |||||
| 10 1/2 | 969' | 95' 8 1/2" | 1003' | 91' 8 5/16" | 999' | 91' 10" | ||||||||||
| 11 | 1077' | 97' 10 1/4" | 1118' | 93' 9" | 1120' | 93' 9" | 1118' | 93' 9" | 1114' | 93' 11" | ||||||
| 11 1/2 | 1194' | 99' 11 3/8" | 1279' | 95' 11 1/4" | ||||||||||||
| 12 | 1320' | 102' 0" | 1379' | 97' 8 1/2" | 1219' | 96' 6 1/2" | 1379' | 97' 8 1/2" | 1379' | 97' 8 1/2" | ||||||
| 12 1/2 | 1455' | 103' 11 7/8" | ||||||||||||||
| 13 | 1600' | 105' 11 1/2" | 1683' | 101' 5 7/8" | ||||||||||||
| 14 | 1379' | 99' 2 9/16" | >17' 8 3/4" | 1379' | 99' 2 1/2" | 17' 8 3/4" | 1379' | 99' 2 1/2" | 17' 8 3/4" | 2041' | 105' 1 1/4" | |||||
| 16 | 1379' | 102' 9 3/16" | 33' 5 3/8" | 1379' | 102' 9 1/4" | 33' 5 1/2" | 1379' | 102' 9 1/4" | 33' 5 3/8" | 2971' | 111' 10" | |||||
| E | 10 | 834' | 104' 10 13/32" | 806' | 104' 1 3/4" | 1' 3 3/4" | 834' | 104 10 1/2" | 833' | 104' 10 1/2" | ||||||
| 11 | 1027' | 109' 6 1/2" | 1027' | 109' 6 1/2" | 1027' | 109' 6 1/2" | 1026' | 109' 6 3/8" | ||||||||
| 12 | 1246' | 114' 0 3/8" | 1121' | 111' 8 1/2" | 4' 7 3/4" | 1246' | 114' 0 1/2" | 1243' | 114' 1 3/4" | |||||||
| 13 | 1491' | 118' 5 1/'2" | ||||||||||||||
| 14 | 1774' | 122' 5 3/4" | 1774' | 122' 5 3/4" | 1774' | 122' 5 3/4" | 1771' | 122' 7 1/4" | ||||||||
| 15 | 2087' | 126' 7" | ||||||||||||||
| 16 | 2446' | 130' 3 5/8" | 2446' | 130' 3 1/2" | 2446' | 130' 3 1/2" | 2449' | 130' 3 3/4" | ||||||||
| F | 16 | 2255' | 146' 7 9/16" | 2253' | 151' 3 1/4" | |||||||||||
| 17 | 2591' | 155' 5 3/4" | ||||||||||||||
| 18 | 2963' | 154' 11 3/8" | 2693' | 159' 6 3/4" | ||||||||||||
| 20 | 3825' | 162' 5 13/16" | 3770' | 168' 5 1/2" | ||||||||||||
| 30' | 13 | 1504' | 127' 8" | |||||||||||||
| 13 1/2 | 1626' | 130' 10 1/2" | ||||||||||||||
| 14 | 1752' | 134' 0 3/4" | ||||||||||||||
| 14 1/2 | 1884' | 137 2 5/8" | ||||||||||||||
| 15 | 2021' | 140' 4" | ||||||||||||||
| 15 1/2 | 2163' | 143' 5" | ||||||||||||||
| 16 | 2311' | 146' 5 5/8" | ||||||||||||||
| 16 1/2 | 2464' | 149' 6" | ||||||||||||||
| 17 | 2623' | 152' 5 3/4" | ||||||||||||||
| 17 1/2 | 2788' | 155' 5 3/8" | ||||||||||||||
| 18 | 2958' | 158' 4 1/2" | ||||||||||||||
| 18 1/2 | 3134' | 161' 3 3/8" | ||||||||||||||
| 19 | 3316' | 164' 1 3/4" | ||||||||||||||
| 19 1/2 | 3504' | 166' 11 7/8" | ||||||||||||||
| 20 | 3698' | 169' 9 3/4" | ||||||||||||||
© Brian Oldford and Keith Norgrove
Editor's note: This page appeared originally on the Scalefour Society website, as a submission from Brian Oldford, but disappeared in the revamp of June 2010. The table reflects Table 7 of "British Railway Track Bullhead Supplement" published by The Permanent Way Institution in 1991, but which seems to be now no longer available.
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