File:Hypothetical concept for placement of rails to achieve five collocated track gauges.png

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Note: The following appears to be an essay about a hypothetical concept. The meaning is obscure, and no references have been cited. Its accuracy and relevance in some parts is disputed. Please see the Discussion page.

There is a bonus but useless gauge of 2134 mm. The lefthand 1676 mm rail will fit with light rails which have a base that is less than 152 mm wide. This system is for Afghanistan, Iran, Syria, Germany, Romania, Bulgaria, Canada, United States, China, etc. (either with or without 1435mm)
The righthand 1435 mm rail cannot use long rails.
1067 mm is useless for high-speed rail networks.

In Central Asia
1-3: 1524mm (5'0")
2-4: 1435mm (4'8.5")
2-5: 1676mm (5'6")
1-5: 2134mm (7'0")
2-3: 1067mm (3'6") will not use
G0: 152mm (0'6") too small
G1: 457mm (1'6")
G2: 368mm (1'2.5")
G3: 241mm (0'9.5")
In Kyrgyzstan, Uzbekistan and Tajikistan: without 1435mm gauge (rail 4).

In North America
1-3: 1524mm (5'0")
2-4: 1435mm (4'8.5")
2-5: 1676mm (5'6")
1-4: 1829mm (6'0")
1-5: 2070mm (6'9.5")
2-3: 1130mm (3'8.5") will not use
G0: 152mm (0'6") too small
G1: 394mm (1'3.5")
G2: 305mm (1'0")
G3: 241mm (0'9.5")

In North America (eliminate 1435mm standard gauge)
1-3: 1676mm (5'6")
2-4: 1524mm (5'0")
2-5: 1829mm (6'0")
1-5: 2286mm (7'6")
1-4: 1981mm (6'6")
2-3: 1219mm (4'0") will not use
G1: 457mm (1'6")
G2, G3: 305mm (1'0") }}