IBLS Track Standard
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| Scale | Ratio | Standard Gauge | Notes |
| 00 | 1:67 | 16.5 mm (0.650 in) | Hornby produced.Generally regarded as the smallest scale for live steam. |
| O | 1:45 | 32 mm (1.260 in) | Popularly used for the small scale live steam. |
| No. 1 | 1:32 | 45 mm (1.772 in) | Popularly used for the small scale live steam. Corresponds to NEM 1 or NMRA #I. |
| No. 3 | 1:22.6 | 63.5 mm (2 1⁄2 in) | The smallest scale able to pull real passengers. Was one of the first popular live steam gauges, developed in England in the early 1900s. In terms of model railway operation, "Gauge '3' " is the largest (standard gauge) scenic railway modelling scale, using a scale of 13.5mm to the foot. The Gauge '3' Society represents this aspect of 2½" gauge railway modelling with both electric and live steam operation. Gauge '3' corresponds to NEM II scale, also known as 'Spur II' in Germany.
The National 2.5" Association continues to support live steam passenger hauling in 2.5" gauge using MES Tracks. They use a 'scale' appropriate to the original prototype modelling both standard and narrow gauge locomotives to run on 2.5" track. |
| 1:16 | 3 1⁄2 in (89 mm) | A worldwide garden railroad scale. Corresponds to NEM III and NMRA 3/4". | |
| 1:12 | 4 3⁄4 in (121 mm) | North America specific scale corresponding to NMRA 1" scale. 1:12 is one of the most popular backyard railway scales. | |
| 1:11 | 5 in (127 mm) | Used outside North America. Corresponds to NEM V. One of the most popular garden railway scales. | |
| 1:8 | 7 1⁄4 in (184 mm) | Used in North-Eastern USA, Canada and the world outside North America. Corresponds to NEM VII. | |
| 1:8 | 7 1⁄2 in (190.5 mm) | Used in the Western parts of the USA. | |
| 1:7.5 | 1.6in=1ft. Used in the USA, often finer-scale. Uses 7.5in gauge. |