From the Maine Narrow Gauge Web Site
Regular Season Dates and Hours: Saturday, May 7th – Sunday, October 30th. During the regular season the museum is open Saturdays-Thursdays from 9:30am-4:00pm, with trains on the hour from 10:00am-3:00pm. On Fridays the museum is open from 11:30am-4:00pm with train rides on the hour from Noon-3:00pm.