Maine Central Railroad Rigby Yard Turntable and Roundhouse

From http://vintagemaineimages.com/bin/Detail?ln=11270&in_size=298:

Rigby Yard was the base of the Maine Central Railroad, and the location of the interchange with the Boston and Maine line. Rigby Yard was built in 1923 on the site of a former horse racing track. By the 1980s, 75,000 cars a year were coming into Rigby Yard.