I don't really think the rail gauge causes any difficulties for automating the system, though. Tram gauges vary a lot and what manufacturers do is just use the same design and put underneath a different width bogie (wheelset).

(The Finnish rail gauge is in fact nominally different from the current one in Russia, because USSR changed from "imperialist" 1524 mm to "metric" 1520 mm between 1970 and 1990; the trains are in practice compatible, though.)