Regina Railway Modellers Association
There are many scales in which you can model trains. The smallest common scale is Z scale (1:220) and the largest indoor scale is G scale (approx. 1:24). The three most common scales are HO, O and N scales. The table below lists each scale and its ratio (e.g. 1:x where 1 inch on the scale model represents x inches in real life).
Let's say we have a GE ES44AC model. This is a photo of the real thing used to illustrate scale.
The table below lists each scale and its ratio (e.g. 1:x where 1 inch on the scale model represents x inches in real life).
SCALE
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RATIO
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SCALE
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NOTES
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Z
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1:220
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1/16 inch to 1 foot
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N
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1:160
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5/64 inch to 1 foot
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TT
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1:120
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3/32 inch to 1 foot
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HO
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1:87
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1/8 inch to 1 foot
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S
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1:64
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3/16 inch to 1 foot
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O
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1:43/1:48
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1/4 inch to 1 foot
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1/43 in Europe; 1/48 in North America
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G
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1:22.5
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1/2 inch to 1 foot
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Size varies according to manufacturer
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HOn3
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1:87
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HO scale rolling stock on narrow guage (N scale) track
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On3
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1:43/1:48
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O scale rolling stock on narrow guage (HO scale) track
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