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2. Dolly (trailer) - Wikipedia

   en.wikipedia.org/wiki/Dolly_(trailer)

   Heavy full trailer needs to have its own brakes remotely controlled by the prime mover vehicle. Semi-trailer – 1 axle (2 wheels), without the front axle but have a landing gear. Large semi-trailer of truck size is designed for connection via the fifth wheel on the tractor unit or the semi-trailer truck.

3. Hand truck - Wikipedia

   en.wikipedia.org/wiki/Hand_truck

   A hand truck. A hand truck, also known as a hand trolley, dolly, stack truck, trundler, box cart, sack barrow, cart, sack truck, two wheeler, or bag barrow, is an L-shaped box-moving handcart with handles at one end, wheels at the base, with a small ledge to set objects on, flat against the floor when the hand truck is upright. [1]

4. Flatbed trolley - Wikipedia

   en.wikipedia.org/wiki/Flatbed_trolley

   A piano trolley or piano dolly is a two- or four-wheeled trolley featuring a stronger-than-usual frame. [4] They are typically measuring approximately 50 to 80 cm ( 19 + 5 ⁄ 8 to 31 + 1 ⁄ 2 in) long and are used by removals companies for moving pianos.

5. Road train - Wikipedia

   en.wikipedia.org/wiki/Road_train

   When road trains get close to populated areas, the multiple dog-trailers are unhooked, the dollies removed and then connected individually to multiple trucks at "assembly" yards. When the flat-top trailers of a road train need to be transported empty, it is common practice to stack them. This is commonly referred to as "doubled-up" or "doubling ...

6. Semi-trailer - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer

   A tractor unit pulling a semi-trailer A truck pulling a semitrailer using a trailer dolly. A semi-trailer is a trailer without a front axle. The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States). [1]

7. Bogie - Wikipedia

   en.wikipedia.org/wiki/Bogie

   Articulated lorries (tractor-trailers) [ edit ] In trucking , a bogie is the subassembly of axles and wheels that supports a semi-trailer , whether permanently attached to the frame (as on a single trailer) or making up the dolly that can be hitched and unhitched as needed when hitching up a second or third semi-trailer (as when pulling doubles ...

8. Tractor unit - Wikipedia

   en.wikipedia.org/wiki/Tractor_unit

   Peterbilt 386 sleeper-cab–style commercial 6×4 tractor unit. A tractor unit, also known as a truck unit, lorry unit, power unit, prime mover, ten-wheeler, semi-tractor, semi-truck, semi-lorry, tractor cab, truck cab, lorry cab, big rig tractor, big rig truck or big rig lorry or simply a tractor, truck, lorry, semi, big rig or rig, is a characteristically heavy-duty towing engine that ...

9. Doodlebug (railcar) - Wikipedia

   en.wikipedia.org/wiki/Doodlebug_(railcar)

   The St. Louis–San Francisco Railway was an early adopter of this technology, placing an initial order for ten gas-electric units in 1910 and seven additional by 1913, giving it the distinction of having the largest fleet of gas-electric motor cars in the country. [6]