GREENFIELD, Mass. (AP) — Dozens of antique tractors are descending on a Massachusetts fairground this weekend for a show of power and strength.

Mike Scranton, organizer of the Retired Iron Tractor Show at the Franklin County Fairgrounds in Greeenfield, tells The Recorder at least 60 tractors are expected.

The highlight of the two-day event is the "weight drag," a contest to see which old tractor can haul the most weight.

Each tractor in the contest will drag a "boat" loaded with stones, and stones will be added until the tractor can no longer pull the weight and is eliminated.

Entry and parking are free, but organizers are asking for donations of $5, as all proceeds will benefit the Franklin County Agricultural Society, which manages the fairgrounds.

The show runs Saturday and Sunday.

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Information from: The (Greenfield, Mass.) Recorder, http://www.recorder.com