GNRi loco wheel diameters

[Moogie-69]

4-4-0

Class

J - Wheel Dia. 5' 7". Coupled wheelbase 7'1" ( O/A wheelbase 5'3" + 6' 4 1/2" + 7' 1")

P - WD. 5' 7". Coupled wheelbase 8'. ( O/A wheelbase 5'3" + 6'10 1/2" + 8')

P - WD. 6'7". Coupled wheelbase 8'. ( O/A wheelbase 5'3" + 6'10 1/2" + 8')

PP - WD. 6' 7" . Coupled wheelbase 8'3".  ( O/A wheelbase 5'3" + 6'10 1/2" + 8'3")

Q - WD. 3'2"/ 6' 7" coupled wheelbase, 8' 8" ( O/A wheelbase 5'9" + 7'6 1/2" + 8'8") Hate to say it (or my wallet hates to think of it) the closest donor loco for a Q Class is a Highland Railway "Loch" Class. It is almost perfect in all dimension apart from the 6' 3 1/1" driven wheels and a slightly longer cab..

QL - WD. 3'2"/6' 7". Coupled wheelbase 9'3"  ( O/A wheelbase 5'9" + 7'6 1/2" + 9'3")

S - WD. 3'2" / 6' 7".  Coupled wheelbase 7'6 1/2" + 9'6".  ( O/A wheelbase 6' + 7'6 1/2" + 9'6")

S2 - WD. 6' 7". Coupled wheelbase 7'6 1/2" + 9'6".  ( O/A wheelbase 6' + 7'6 1/2" + 9'6")

U - WD. 3'2" / 5' 9". Coupled wheelbase 8'3". ( O/A wheelbase 5'3" + 6'10 1/2" + 8'3")

V - WD. 3'2" / 6' 7". Coupled wheelbase 10'8" (O/A wheelbase 6'6" + 7'7" + 10'8". Tender WD. 3'8". wheelbase 6'6" + 6'6"

VS - WD.  3'2" / 6' 7". Coupled wheelbase 10'8" (O/A wheelbase 6'6" + 7'7" + 10'8".  Tender WD. 3'8". Wheelbase 6'6" + 6'6"

 

0-6-0

C - WD. 5' (*4'7"). Coupled wheelbase 7'2" + 7'10"

D - WD. 5' 1 3/4". Coupled wheelbase 7'3" + 8'3"

E - WD. 5'. Coupled wheelbase 7'3" + 7'9"

B - WD. 4' 7 1/2". Coupled wheelbase 7'3" + 7'3"

A - WD. 4' 7". Coupled wheelbase 7'3" + 7'3"

AL - WD. 4' 7". Coupled wheelbase 7'6" + 7'6"

PG - WD. 4' 7 1/4". Coupled wheelbase 7'6" + 8'1"

QG - WD. 4' 7 1/4".Coupled wheelbase 7'10" + 8'10"

LQG - WD. 4' 7 1/4". Coupled wheelbase 7'10"  + 8'10"

NQG - WD. 4' 7". Coupled wheelbase 7'10" + 8'10"

NLQG - WD. 4'7". Coupled wheelbase 7'10" + 8'10"

UG - WD. 5' 1". Coupled wheelbase 7'3" + 8' 4 1/2"

SG - WD. 5' 1".  Coupled Wheelbase 8'1" + 8'10".

SG2 - WD. 5' 1".  Coupled Wheelbase 8'1" + 8'10".

SG3 - WD. 5' 1".   Coupled Wheelbase 8'1" + 8'10". Closest chassis i can find at the moment is a J39 , Coupled wheelbase 8' +  9'. Length of loco is similar but smoke box, boiler and cab is a fair bit bigger.

Crane Tank - WD. 3'4". Coupled wheelbase  5' + 5'

 

0-6-0T

BT - WD.4'7". Coupled wheelbase 6'6" ( O/A wheelbase 6' 9 1/2"" + 6'6')

 

 

 

2-4-2T

JT - WD. 5'7". Coupled wheelbase 7'1" ( O/A wheelbase 7' + 7'1" + 6'5")

 

4-4-2T

T1 - WD. 3'2" / 5' 9" / 4'. Coupled wheelbase 8'3" ( O/A wheelbase 5'3" + 6'10 1/2" + 8'3" + 8')

T2 - WD. 3'2" / 5' 9" / 4'. Coupled wheelbase 8'3" ( O/A wheelbase 5'3" + 6'10 1/2" + 8'3" + 8')

 

4-2-2

JS - WD. 6'7".  ( O/A wheelbase 5'3" + 6'8 1/2" + 7')

 

4-4-0 T

BP - WD. 4'7". Coupled wheelbase 7'6" (O/A wheelbase 4' + 7'3" + 7'6")

T - WD. 4' 7"

BT - WD. 4' 7". Coupled wheelbase 6'6" (O/A wheelbase  5'3" + 5' 10 1/2" + 6'6")

 

0-6-4 T

RT - WD. 4' 3"/ 2'8". Coupled wheelbase 7' + 6'6". ( O/A wheelbase 7'0" + 6'6" + 5' + 5'3")

 

2-4-0

G - WD. 5'7". Coupled wheelbase 7'1" ( O/A wheelbase 6'11" + 7'1")

H - WD. 6' 0 1/2". Coupled wheelbase 8' ( O/A wheelbase 7' + 8')

 

2-4-2T

JT - WD. 5' 7"

 

0-6-2T

QGT - WD. 4' 7"/ 3'7 1/2".  Coupled wheelbase 7'6" + 8'6".  ( O/A wheelbase 7'6" + 8'6" + 6')

QGT2 - WD. 4.7 1/4" / 3'8". Coupled wheelbase 7'6" + 8'10".  ( O/A wheelbase 7'6" + 8'10" + 6')

0-4-0T

No. 203 - WD. 2' 8 1/2"

 

0-4-2

K - WD. 5'1". Coupled wheelbase 7'2" ( O/A wheelbase 7'2" + 6'10")

 

0-4-2

F - WD. 5'. Coupled wheelbase 7'9". ( O/A wheelbase 7'9" + 6'11")

Edited 9 minutes ago by Moogie-69

[Moogie-69]

Updated.

[Mol_PMB]

It’s probably worth adding the coupled wheelbase and overall length to the listings; these also need to be reasonably close for a model to look plausible. 
Also a note on cylinders and valve gear (inside/outside etc). 
 

As far as the models are concerned, older models are more likely to have a separate chassis which can be fitted into a replacement body. New models with a lot more gadgets often have much more integration between body and chassis, so are less easy to modify. 
 

[Moogie-69]

Update 2