ROCK ISLAND 4-6-2 Locomotive No. 1000

Rhinochugger

Rhinochugger

Retired Oik (IBT)
27 Oct 2009
26,129
877
North West Norfolk
Your math is fine..
and the solution to the discrepency is simple: All kinds of model trains, in many scales, run on a gauge that doesnt precicely match the scale. ;)
It's been going on since the dawn of time, was very common in the O-scale and S-scale Tinplate world, and we still have a lot of it today: 1/29, On30, HOn30..

Scot
.......... and over here we have 00 - which runs on 16.5 mm track but is 4mm : 1ft ................... and, surprisingly is probably the most popular model railway scale in the UK :think::think::think:
 
P

Paul M

Registered
25 Oct 2016
3,755
423
56
Royston
I'm sure it's not you, it's the model manufacturer making life easy for themselves and telling small fibs about the accuracy of the model
 
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N

norman

Registered
1 Jan 2013
74
5
Hi Scot & others,

PRINTED AT 200% LEDGER LETTER PAPER SIZE, PORTRAIT
http://s3.amazonaws.com/rrpa_photos/82493/20120811_110040.jpg
Inline image

The Above Image Printed At 200%,
The Pilot Truck WHEEL Measures 75 mm Dia. , The Driver WHEEL Measures 161 mm Dia.
The BUDDY L Pilot Truck Wheel Measures 1 - 3/4 inches = 1.75 Inch.
The BUDDY L Driver Correct Sized Wheel Calculates To :

75 * X = 161
X = 161 / 75

The BUDDY L Driver Correct Sized Wheel = 1.75 Inch * 161 / 75 = 3.75 Inch ( or 3.757 Inch )



3.75 Inch * Scale of 19.2 = 72 INCH

From Scot , " The Prototype Rock Island pacifics had driver diameters between 69" and 74". ".


THANKS SCOT !!!!!




Norman
 
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KeithT

KeithT

Hillwalking, chickens and - err - garden railways.
24 Oct 2009
13,018
21
Nr Manchester
Blimey! After reading all this my head hurts, I am going for a lie down . . . .
 
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