Tracked vehicles

thumb|Hidromek excavator in [[Alicante, Spain]]

thumb|300px|A large bulldozer with multi-shank ripper, the Caterpillar D9

thumb|A snowmobile tour at Yellowstone National Park thumb|First person view of a snowmobile driven through Yellowstone National Park.

system of vehicle propulsion

thumb|upright=1.35|Citroën P17 half-track truck of the early 1930s

250px|thumb|The wide tracks of this 1991 Logan Machine Company|Logan snowcat reduce the [[ground pressure and improve grip but render it vulnerable to bumps]]

The crawler-transporters, formally known as the Missile Crawler Transporter Facilities, are a pair of tracked vehicles used to transport launch vehicles from NASA's Vehicle Assembly Building (VAB) along the Crawlerway to Launch Complex 39. They were originally used to transport the Saturn IB and Saturn V rockets during the Apollo, Skylab and Apollo–Soyuz programs. They were then used to transport Space Shuttles from 1981 to 2011. The crawler-transporters carry vehicles on the mobile launcher platforms (MLPs) used by NASA, and after each launch return to the pad to take the platform back to the

Thiokol was an American corporation concerned initially with rubber and related chemicals, and later with rocket and missile propulsion systems. Its name is a portmanteau of the Greek words for sulfur () and glue (), an allusion to the company's initial product, Thiokol polymer.

car model

American vehicle company

1,150 horsepower tractor crawler

specialized passenger transport vehicle designed to operate over snow or ice

tracked frame-steered vehicle

bulldozer modified for use in combat engineering

track-type tractor bulldozer

armored personnel carrier

large bulldozer, manufactured by Caterpillar Inc

tracked vehicle

track-type tractor

small construction excavator

Ski-Doo is a brand name of snowmobile manufactured by Bombardier Recreational Products (originally Bombardier Inc. before the spin-off). The Ski-Doo personal snowmobile brand is so iconic, especially in Canada, that it was listed in 17th place on the CBC's The Greatest Canadian Invention list in 2007.

snowmobile

wheel with articulated rails attached

large hydraulic excavator manufactured by Caterpillar

1956 medium bulldozer

medium bulldozer

small Swedish snowcat

process of manipulating snow

type of vehicle suspension system