Price in 1955: $14.95 Couple this "B" unit with the sensational Diesel Roar sound effects behind our Silver Flash "A" unit locomotive and you'll have a Diesel "growler" that really sounds like the McCoy. Advance the throttle and hear the big motors build up to a thundering roar – reduce the throttle and the motor roar diminishes to a booming idle. It's the peak of railroading fun! Locomotive also has realistic built-in Horn. "B" unit is 12 1/4" long.