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Gauge 1

Gauge One / Gauge 1 is a popular gauge that has been around for over a hundred years, and uses a track gauge of 45mm (technically it is 44.45mm / 1¾ inches, but we generally refer to as 45mm)

Interestingly the track used for Gauge 1 has also been adopted for use in G-Scale modelling.

Although the gauge is fixed at 45mm,  it took several years before general agreement on the scale was reached in the UK at 10mm/foot, slightly larger than the near-correct proportions of 1/32 because this offered the advantage of a tad more room to squeeze in working parts.

In practice, Gauge One models are 300 – 600mm (one to two feet) in length, which is about 50% longer than O gauge models and 50% shorter than “3 ½ inch”.

Another interesting observation is that Gauge 1 models were traditionally “live Steam” , the majority of modern Gauge 1 models are now manufactured to run from 12 – 24V, either AC/DC or DCC control . Modern sound and dynamic steam has also become common.

The most Popular Control options for G-Scale and Gauge 1 include:

  • ESU Ecos 50210
  • Marklin CM2 / CM3
  • LGB Massoth
  • Roco/Fleischmann z21/Z21


Resources (courtesy Gauge 1 Association):

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