Model railway scale calculator
Convert between the real world and the layout.
Prototype would be doing
32.4 km/h
| mph for the prototype | 20.13 |
| Model speed | 200 mm/s |
| Crosses 1 m of layout in | 5 s |
At 1:45 (O), standard gauge (1435 mm) scales to 31.89 mm, against the 32 mm track the scale is sold on. Metre gauge works out at 22.22 mm, the reason Swiss narrow gauge at this scale runs on 22.5 mm (Om) track.