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https://www.railjournal.com/rolling-stock/goldenpass-variable-gauge-system-successfully-tested/
You can see the system in operation here.
Is this the first case of variable gauge between the standard and narrow gauges?PROSE has successfully tested a newly-developed gauge-changing bogie and the associated gauge changing system in Zweisimmen. The system has been designed to allow operation on both Montreux Oberland Bernois Railway’s (MOB) metre-gauge line and BLS standard-gauge infrastructure.
As well as changing the bogie between standard gauge and metre gauge, the system also adapts the floor height of the coaches to match platform heights, which vary by 180mm.
You can see the system in operation here.