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I know there is at least one working piece like that in railway museum in Chabowka (Poland). Here is a link to museum page with a picture: http://www.parowozy.pl/skansen/tspecjalny/M20/ Sorry, there is no English version of this page but i says there that it could go up to 100 km/h on rails and was also able to go on roads.
But the car on picture here is in different color and If I can see well there is a Slovakian flag far behind it so it may be different car.