Westerasmaskiner (Aktiv) Snow-Trac ST4
For many years, the machine before the Sprynt 
was the Skinner, or Westerasmaskiner. 
It had a Volkswagen 1200cc air cooled gas engine, Volkswagen transmission, narrow tracks, cabin like a bus, Rear Door access only, 2 swing out windows, and no interior heaters originally.  They added an optional gas heater to the left of the driver later on, which burnt the hell out of your left arm, meanwhile your body would freeze.  Also your right gas pedal foot would cook,  while your left clutch foot would freeze.   It was the only machine at the time, with a steering wheel, it was a very poor design, in that before you came to a corner you had to start turning like mad, and depending on the snow conditions you might, or might not turn in time.   It took some practice to get it right.    The machine was very reliable most of the time.  Passengers sat facing the center of the machine on side benches.    Outside it had 2 side rails , above the tracks, for storing gear. Made in Sweden, used as a school bus.

Length  3.64 m (11 ft 11 in) 
Width 1.90 m (6 ft 2 in) 
Height 1.85 m (6 ft) 
Unladen Weight 1.35 tonnes
max speed 24kmh
Steering mechanism was via a variator belt, and disk assembly
which would brake one drive shaft or the other.
Power was supplied thru a huge duplex chain to the drive sprockets.
The chain made the machine a little noisy.
Units are still for sale on the Internet, and wanted by buyers.
These units were even made into armoured vehicles, for British Commandos.
The over snow vehicle Snow-Trac was invented by Lars Larsson an engineer who worked for Vasteras Maskiner in Morgongava, Sweden a company that manufactured farming equipment.  In 1955 he registered a patent for his creation. Vasteras Maskiner, later renamed Aktiv, 
There is even a matchbox toy of this machine, made in 1964,
plus a puzzle made by Matchbox.
I can only ask why??