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 unsynchronized transmissions made when the driver shifted gears on the steep roads of the park.

The White Motor Company Model 706 chassis with a 94 hp (70 kW) 318 cu in (5.2 L) White 16A flathead inline 6-cylinder engine and body by Bender Body Company outperformed its competition during a group test at Yosemite National Park in California in 1935, leading to that model's selection by the National Park Service.

[3] Each of the Red Jammers built for Glacier accommodated seventeen passengers on four four-abreast bench seats (plus one in front, next to the driver), with five doors on the right-hand (curb) side of the vehicle for passengers and one door on the left for the driver; there were four forward and one reverse speeds that required double-clutching to shift between them, with a top speed of approximately 45 mph (72 km/h).

[6] Transportation in Glacier was originally established in 1913 using stagecoaches, but their reliability was poor due to the primitive roads and alpine weather; Walter White floated the idea of using his company's vehicles instead to Louis Hill, who had developed the park's master tourism plan in 1914, and Roe Emery's Glacier Park Transportation Company started an evaluation period that summer with ten 11-passenger buses, five 7-passenger touring cars, and two trucks supplied by White Motor Company.

[7] The completion of Going-to-the-Sun Road in 1933 forced GPTC to order new buses, as the existing fleet could not traverse Logan Pass.

However, the well-intentioned modifications in 1989 added stresses to the frame; during the summer 1999 season, one of the Red Jammers lost a front axle after the increased stresses had cracked the front frame members, and closer inspection revealed cracks in many buses,[12] forcing the park's concessionaire to retire the fleet immediately.

[13] The initial reaction was to make the retirement permanent, but a letter writing and phone campaign convinced the National Park Service to inspect the buses more thoroughly after the 1999 season.

[16] Glacier's entire operating fleet was modified between 2000 and 2002 by Ford in conjunction with TransGlobal in Livonia, Michigan, to run on propane or gas to lessen environmental impact.

[20] The fenders were replaced with fiberglass replicas to accommodate the wider wheels, reduced in diameter from 21 to 16 inches (530 to 410 mm), and numerous detail improvements were made, including replacing the original plywood floors with aluminum, upgrading exterior lights, and fitting safety glass windows.

[2][23] In Glacier, the challenge of driving Going-to-the-Sun road meant a steady demand for bus tours unlike the other parks, where the popularity of private automobiles led to the discontinuance of bus tours, and the other parks sold off their White 706 buses when continued maintenance became too costly in the 1960s.

[34] Two ex-Yellowstone White 706s were restored in the 1990s by Jack Damratoski; they were eventually sold to conduct tours in the Napa Valley region of California.

386) was restored and sold to the Montage Hotel in Big Sky, Montana, where it will shuttle guests after its scheduled 2021 opening.

[33] A White 706 which operates in Anaconda, giving tourists a ride around the town,[40] is one of the buses originally built for Yellowstone, repainted in Red Jammer livery, distinguished by the gateswing doors on the rear and the metal bars on the rearmost side windows of the bus's luggage compartment.

The Union Pacific Railroad subsidiary Utah Parks Company operated White 706 buses on the Grand Circle loop tour, ferrying passengers from the railroad depot at Cedar City, Utah to Zion, Grand Canyon (North rim), Bryce Canyon, and Cedar Breaks.