Alan Gibson
Coupling Rods and Valve Gear
10 November, 2005

Coupling Rods for 4-coupled Locomotives

Code Size Scale Prototype
4M95 6' 10" 27.3mm. SR Class O2 Tank
4M82 7’ 0" 28.0mm. LNER Class F7 Tank
4M75 7’ 4" 29.3mm. GWR Class 14XX etc.
4M84 7’ 6" 30.0mm. SR Class M7 etc.
4M97 7’ 9" 31.0mm. LNWR
4M85 8' 0" 32.0mm. LNER Classes F4, F5, F6
4M98 8' 3" 33.0mm. LNWR
4M76 8' 6" 34.0mm MR, LMS, GWR
4M83 8' 9" 35.0mm LBSCR
4M81 9' 0" 36.0mm. MR, LMS, GWR
4M77 9' 6" 38.0mm MR, LMS, GWR
4M99 10' 0" 40.0mm. SR Schools (straight rod)
4M120 10' 0" 40.0mm SR Class L (fishbelly rod)
4M92 Universal Adjustable For 4 or 6 coupled wheelbase

Coupling Rods for 6-coupled Locomotives

Code Size Scale Prototype
4M131 6' 0"+6' 0" 24+24mm LBSCR/SR Terrier Tank
4M133 6' 3"+7' 6" 25+30mm SR Class H15
4M93 6' 4"+7' 6" 25.3+30mm LNER Class J69
4M142 6' 9"+7' 0" 27+28mm BR Class 2
4M96 6' 10"+7' 5" 27.3+29.7mm SR Class G6 etc.
4M91 7' 0"+7' 0" 28+28mm BR Brittania, Clan, Duke.
4M132 7' 0"+7' 6" 28+30mm SR Class N15
4M72 7' 0"+7' 9" 28+31mm GWR  Hall, Manor, Mogul
4M89 7' 0"+8' 0" 28+32mm BR Class 4, LMS Class 5
4M135 7' 0"+8' 6" 28+34mm BR Class 5
4M134 7' 3"+7' 9" 29+31mm SR Class U
4M71 7' 3"+8' 3" 29+33mm GWR Pannier, Collet goods
4M79 7' 3"+8' 3" 29+33mm LNWR Coal tank, Watford tank
4M88 7' 3"+9' 0" 29+36mm LNER Classes N2, J6, B17
4M127 7' 4"+7' 4" 29.3+29.3mm GWR
4M90 7' 4"+8' 0" 29.3+32mm LMS Jubilee, Patriot
4M130 7' 4"+8' 2" 29.3+32.7mm SR
4M128 7' 4"+8' 4" 29.3+33.3mm GWR
4M141 7' 7"+7' 9" 30.3+31mm BR Classes 3 and 4
4M80 7' 7"+8' 6" 30.3+34mm LNER Class J15
4M86 7' 9"+7' 6" 31+30mm LBSCR
4M87 8' 0"+8' 0" 32+32mm LBSCR
4M78 8' 0"+8' 3" 32+33mm GWR King
4M70 8' 0"+8' 6" 32+34mm MR/LMS Classes 2F, 3F, 4F
4M92 Universal Adjustable For 4 or 6 coupled wheelbase

Coupling Rods for 8-coupled Locomotives

Code Size Scale Prototype
4M121 5' 3"+5' 3"+5' 9" 21+21+23mm WD/BR 2-8-0
4M123 5' 6"+5' 6"+6' 3" 22+22+25mm LMS Class 8F
4M124 7' 0"+6' 0"+7' 0" 28+24+28mm GWR Class 42XX
4M125 5' 5"+5' 5"+6' 0" 21.7+21.7+24mm GWR Classes 28XX/38XX
4M126 6' 6"+6' 6"+7' 0" 26+26+28mm GWR Class 47XX
4M144 6' 9"+5' 9"+5' 9" 27+23+23mm LMS Class 7 (Austin 7)
4M140 6' 0"+5' 6"+6' 0" 24+22+24mm SDJR 2-8-0

Coupling Rods for 10-coupled Locomotives

Code Size Scale Prototype
4M122 5' 3"+5' 3"+5' 3"+5' 3" 21+21+21+21 WD/BR 2-10-0
4M143 5' 5"+5' 5"+5' 5"+5' 5" 21.7+21.7+21.7+21.7 BR Class 9F

Connecting Rods

Code Prototype
4M73 GWR 61XX, 28XX, Manor, Hall etc
4M74 GWR Castle, Star, King

Sets of Coupling and Connecting Rods

Code Size Scale Prototype
4M94 7' 6"+7' 3" 30+29mm SR West Coutry/Battle of Britain
4M129 7' 6"+7' 6" 30+30mm SR Merchant Navy

Sets of Valve Gear and Connecting Rods
(Note; coupling rods not included)

Code Prototype Code Prototype
4M52/1 LMS Jubilee 4M52/12 SR Schools
4M52/2 LMS Black 5 4M52/13 LNER Class B1
4M52/3 LMS Stanier 2-6-0 4M52/14 BR Class 4 2-6-0
4M52/4 LMS Stanier 8F 4M52/15 LNER Class A3
4M52/5 LMS Duchess 4M52/16 LNER Class L1
4M52/6 BR Britannia 4M52/17 SR Lord Nelson
4M52/7 WD 2-8-0/2-10-0 4M52/18 BR Class 2 2-6-0
4M52/8 BR Rebuilt Bullied 4M52/19 LNER Class A2
4M52/9 SR Class U/U1 4M52/20 LNER Class A1/1
4M52/10 LNER Class A1 4M52/21 SR CLass H15
4M52/11 SR Class N15 4M52/22 SR Class S15

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Last Updated on 10/11/05
By Keith Norgrove