I've never heard or seen this vintage snowmachine, the Larven

those handles are for hanging onto, they don't steer the machine, your feet do... with skis on them (first video)

a Swedish snowmobile and has reached a cult status among snowmobile enthusiasts. A larva consists of a long caterpillar and an engine located approximately in the middle. The steering takes place with skis on the feet. The larvae were manufactured by Lenko in Östersund from the 60's to the 80's

http://www.hilmersson-racing.com/larven-bigbloc/
http://www.hilmersson-racing.com/larven-nyar-2013/