Model railway scale calculator
Convert between the real world and the layout.
Prototype would be doing
62.64 km/h
| mph for the prototype | 38.92 |
| Model speed | 200 mm/s |
| Crosses 1 m of layout in | 5 s |
At 1:87 (HO), standard gauge (1435 mm) scales to 16.49 mm, against the 16.5 mm track the scale is sold on. Metre gauge works out at 11.49 mm, the reason Swiss narrow gauge at this scale runs on 12 mm (HOm) track.