The Pierce-Arrow gasoline engine has been replaced, first with a war-surplus GMC gasoline engine at the RGS, then at Knott's with a war-surplus 6 cylinder in-line Diamond-Reo gasoline engine. The wooden limousine body was replaced after World War II with a 1939 Wayne military-surplus bus body with both left and right doors. A RGS shop-built freight box (converted with trolley seats for passenger service in 1950) articulates on the kingpin over the chain driven center truck. Later a bogie truck replaced the rear axle, linked to the front truck by a chain drive. The Galloping Goose was constructed from a Pierce-Arrow limousine frame, engine, radiator, cowling and body with a four- wheel truck at the front and putting flanged wheels on the rear axle. Knott purchased the RGS Motor #3, which is run on the GT&C during the off-season – when there aren't sufficient passengers to justify hostling a steam locomotive. Their last use was to scrap their own line in 1953. " Galloping Goose" motor rail buses kept the Rio Grande Southern railroad viable from the 1930s by carrying mail. 340 was rebuilt in 2016 and is in use, alternating services with RGS No. 41 Red Cliff (recently renamed Walter K at the 60th anniversary ceremony January 12, 2012) from the Rio Grande Southern. 40 for many years on the GT&C) from the Denver & Rio Grande Western and RGS No.
340 Green River (formerly D&RG #400, named Gold Nugget No. When retired from service in Colorado, they were D&RGW No. The roster includes two C-19 2-8-0 " Consolidation" type steam locomotives built by Baldwin Locomotive Works for the Denver & Rio Grande in 1881.