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A snow coach is a specialized passenger transport vehicle designed to operate over snow or ice, similar to a large, multi-passenger snowcat that is equipped with bus-style seating. These vehicles may have multiple sets of very large, low-pressure tires, or they may have tracks. Snow coaches may seat ten or more passengers and are often used for sightseeing tours or for over-snow transportation.
An early example of a snow coach was the Snow Bus built by Bombardier in Canada. It was equipped with front skis and rear tracks and typically could seat 12 passengers. Alternatively, the front skis could be removed and replaced with front wheels. There are documented uses of the Bombardier Snow Bus being used as a school bus for mail delivery and as emergency vehicles, but they were also used for tours and transportation in snowbound areas.
In the early 1960's, Thiokol produced the 601 series snowcats which were often configured to carry ten passengers. While not a tour bus type snow coach, these found utility with the United States Air Force as well as private industry.
A modern example: the Terra Bus
The Terra Bus wheeled vehicle is one of the few snow-coach-type vehicles currently produced. It is an all-wheel-drive, three-axle, off-road bus which is specially constructed for use in Arctic climates by the Canadian specialty vehicle manufacturer Foremost, based in Calgary.
The Terra Bus can transport up to 56 passengers. The vehicle is equipped with six extra-large, low-pressure tires typically filled to 30 pounds per square inch (210 kPa). One Modified Terra Bus can be found transporting passengers at the Antarctic research station, McMurdo Station. Twenty-two unmodified Terra Buses can be found at the Columbia Icefield and at Jasper National Park, being operated by Brewster Co. for their Ice Explorer tour.
Terra Bus Specifications
- Length: 14.89 metres (48.9 ft)
- Height: 3.96 metres (13.0 ft)
- Curb weight: 24.95 tonnes
- Maximum gross vehicle weight: 29.94 tonnes (33 Tons)
- Type: Detroit Diesel Series 50
- Power: 250 hp (187 kW) at 2100 rpm
- Transmission: Clark 34600 Series Power Shift
- Top speed: 40 kilometres per hour (25 mph), 18 kilometres per hour (11 mph) on the Athabasca Glacier
- Turning radius: 21.9 metres (72 ft)
Snowcoaches can be outfitted with either a rubber track or a ski system (replacing tires). Often called by the brand name Mattracks, these rubber track systems can travel over thinner snow depths and even bare road patches without tearing up roadways. Metal-based ski systems can cause more damage or get stuck when traveling over snow-free patches. Subsequently certain roads may be restricted to just Mattrack-equipped snow coaches, based on road conditions.
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