Red Jammers are the vintage White Motor Company/Bender Body Company Model 706 buses used at Glacier National Park in the United States to transport park visitors since 1936. While the buses are called reds for their distinctive livery, painted to match the color of ripe mountain ash berries, the bus drivers are called jammers because of the sound the gears made when the driver shifts on the steep roads of the park. The "jamming" sound came from the unsynchronised transmissions, where double-clutching was required to shift gears prior to a 1989 retrofit that added automatic transmissions.