What is the width differance
There is no such thing as a ‘mid gauge’.Gauges are either standard – 4’8&1/2”, narrow, which is any gauge less than that down to about 1’6” (lower than which it becomes minature) or wider than standard which is wide gauge, e.g. 5’3” as in Ireland. The difference is in the wheel base. You can have complete systems with full range of services on a so-called narrow gauge (e.g South African Railways, 3’6”), no different to those on standard gauge.
The difference is the distance between the rails. You can find narrow gauge of 760mm, 1000mm in Europe besides a few more. UIC gauge is 1435 as used in the Europe, US and others.
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