Subsidized by the Chicago, Burlington & Quincy Railroad, which had lines into Wyoming from the Midwest, four park concessionaires organized the Cody-Sylvan Pass Motor Co. in April 1916. Orders were place for seven White Motor Company 3/4-ton truck chassis with open bodies. Railroad financing, coupled with the potential for new business, encouraged White to provide these vehicles on most favorable terms. The first revenue passengers were transported from Cody to Lake Hotel on July 1, 1916. By the end of the season, more than 3000 passengers had been carried.

Recognizing bus service was in the Park to stay, Director Stephen T. Mather, director of the newly formed National Park Service, called the Yellowstone concessionaires to Washington D.C. in the fall of 1916. Yellowstone Park Transportation Company (YPTCo.) was given exclusive rights to operating the public transportation facilities, which were to be motorized before the following season.

White's pioneering paid off. The Yellowstone Transportation Company contracted with White Motor Company to purchase 100 sightseeing vehicles and 17 touring cars, with tires and spare parts, for $427,104.67. While the vehicles themselves were not unique, their livery of English Coach Yellow with black trim, the sheer size of the fleet and the operating conditions at Yellowstone, attracted the attention of tourists and industry observers alike.

The touring car bodies had four pairs of doors, each opening on a three-seat bench, providing space for 11 passengers and the drivers. When loaded, the buses always parked with the right side toward the preceding bus or away from traffic to protect passengers. Later, the left hand doors were sealed and the spare tire was mounted on a fixed outside rack to the left of the driver. Headlights were supplied with acetylene from a small tank on the left running board.

Baggage was stowed at the rear on a wooden platform and covered by a canvas boot. This carryover from stagecoach days was later replaced by a wood and metal trunk with a canvas cover. A canvas top supported by a detachable bow at each bench was provided, as well as celluloid windows, which could be put up to protect passengers when necessary. Company policy was to drive with the top down except in inclement weather. Lap robes were provided at each seat for chilly days.

Over the years, White Motor Company provided additional and more modern touring buses and cars for Yellowstone travelers. By 1936, the fleet was at is height, numbering 325 buses. As use of the personal automobile became more popular and railroad travel decreased, the need for a large bus fleet also waned. In 1940, many of the 240 remaining buses were sold and, after the war, in 1946, only 124 buses remained in service. By 1959, other buses were being leased, and only 40 White buses were retained. As years went by, White buses were relegated to filling in when more capacity was needed and to move employees
between Park facilities.