THOMAS & FRIENDS™ - NARROW GAUGE HIGH-SIDE WAGON - BROWN - HO Models that run on N scale track. High Side Wagons are used to haul, coal and timber on the island of Sodar, the symbol BMQ (representing Blue Mountain Quary) is printed on the side of the Wagon. These wagons are based on those used by the Talyllyn Railway. Bachmann carefully reproduces your favorite Thomas & Friends™ characters. All rolling stock features highly detailed, realistic plastic body shells, all-metal wheels, and narrow gauge international-style hook-and-loop couplers. A narrow-gauge railway is one where the spacing between the rails is less than the standard (4 ft 8 1⁄2 in) spacing found on typical railroads. Historically, narrow-gauge railways are most often found in mining, logging, light industrial, and light passenger service..