Definitions for 1 gauge
A model railway gauge of 1.75 inches (44.45 mm).
Gauge 1 is a model railroading and toy train standard, popular in the early 20th century, particularly with European manufacturers. Its track measures 1.75 in, making it larger than 0 gauge but slightly smaller than wide gauge, which came to be the dominant U.S. standard during the 1920s. No 1 gauge was standardised, according to Model Railways and Locomotive magazine of August 1909 at 1.75 in . The distance between the wheel tyres at 1+17⁄32 in and between the centre of the track 48 mm. The wheel width was set at 19⁄64 in. Definitions using gauge, rather than scale, was used more common in the early days with the four gauges for which standards were adopted being No. 0, No. 1, No. 2 and No. 3.
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