Don Horne, right, and Richard Antanavich re-assemble the slide rails of a 1972 Arctic Cow Thursday in the Mount Vernon barn the vintage snowmobile racers use as a clubhouse. The men rebuild vintage snow machines to compete in races, at speeds up to 50 miles per hour, across New England. Cold weather this week kept them in the shop instead of riding the trails, Antanavich said.

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