These big buses are made in Foremost, Alberta by Foremost Industries, a company that designs, manufactures and markets "high-mobility all-terrain wheeled and tracked vehicles used to transport heavy loads where there are no roads". The design of these vehicles provides for high approach and departure angles, deep fording ability and the ability to cross, descend and ascend steep slopes.
The Foremost Terra Bus is an all-wheel drive, three-axle, 56-passenger, off-road bus. Examples can be found shuttling tourists on the Columbia Icefield in Canada's **er National Park and transporting scientific personnel in the Antarctic.
Below are some images of these huge buses. Click on each small picture to see a large version.
