E7 on B&M’s Mountaineer By Angela Cotey | August 10, 2022 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Brand-new E7 3810 leads Boston & Maine’s Mountaineer out of Boston in June 1946. The diesel illustrates the as-delivered scheme of B&M’s E7’s, with silver at the rear of the maroon and yellow carbody. Albert G. Hale photo