Being from Flint, Mi., where they build a 'few' pickups, mostly the HD series. I know GM had an option code for HI-Rail pickups, probably still does. It shortened the the rear axle to match the rail gauge. Years ago I believe they told me they were the only mfg that offered it as an option. Other brands were modified by custom converters after assembly.
Hi-rail vehicles - Trains Magazine
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