7 mm scale
Model railway scale
7 mm scale, also known as British O scale, is a model railway scale of 1:43.5 (or 7 mm to 1 ft; hence its name). The scale is thus different from American O scale (1:48) and European O scale (1:45). For standard gauge railways, 32mm gauge, or 0 gauge is most commonly used. ScaleSeven (S7) standard however specifies 33 mm gauge, which is closer to scale. For narrow gauge modelling, 16.5 mm gauge
| Name | Model gauge | Scaled gauge | Prototype gauge |
|---|---|---|---|
| Prototype standard gauges | |||
| British 0 gauge | 32 mm (0 gauge) | 4' 6¾" | Standard gauge |
| ScaleSeven (standard) | 33 mm | 4' 8½" | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
| Prototype broad gauges | |||
| ScaleSeven (Irish) | 36.75 mm | 5' 3" | 5 ft 3 in (1,600 mm) Irish gauge |
| ScaleSeven (Great Western) | 49.2 mm | 7' 0¼" | 7 ft (2,134 mm) Great Western broad gauge |
| Prototype narrow gauges | |||
| O21 | 21 mm | 3' | 3 ft (914 mm) |
| O16.5 | 16.5 mm (H0 gauge) | 2' 4¼" | 2' - 2'6" |
| O14 | 14 mm | 2' | 2 ft (610 mm) |
| O9 | 9 mm (N gauge) | 15½" | 15 in (381 mm) |
Sources and credits
This article is adapted from the Wikipedia article “7 mm scale”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Locomotor model.jpg by Les Chatfield from Brighton, England, CC BY 2.0
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