Tub - in the transport of coal mining, ore and waste rock and other bulk materials handling vehicle narrow-gauge railway, generally have to use locomotives or traction winch.

Tub and unloading in different ways according to the structure is divided into: fixed tub, tipping bucket, tub, unilateral music tracks Dropside tub, the bottom (side) dump carts and shuttle tub 5 categories.

3.1 Fixed tub

Carriages and the frame fixed connection to be used dumper unloading the carts turn. The basic composition of the carriages, frames, buffers, coupling and running gear. Frame is a metal structure, able to withstand the traction, braking force, the collision between the carts and rail impact force in the frame buffer is installed at both ends to ease the impact between two vehicles. Coupling is connected locomotives and tub parts, commonly used rotary latch chain link and a large tub used both the role of automatic couplers buffer. Travel agencies by four wheels and two axes consisting of two rounds of pairs. Tub and the sum of more than 20 tons of materials, generally should increase the number of wheel. For more than two rounds of the tub, to facilitate the adoption curve will be composed of two wheels on a wheel of the car, this car is called bogies.

3.2 Dump Mine Car ;tipping bucket, tub

Carriages for the V-shaped cross-section or U-shaped frame in turn supporting the transition, the carriages unloaded on the flip transition in turn.

3.5 Unilateral tramcar song track Dropside

Trunk of one or both sides can open, with the loading unloading ore at the mine discharge point on the curved rail to the tub tilt rod to open the side door unloading.

3.4 at the end (side) dump mine car

Trunk of one or both sides can open, with the loading unloading ore at the mine discharge point on the curved rail to the tub tilt rod to open the side door unloading (Dropside) or by gravity back or trunk floor open to the side of the unloading ( hopper).

3.5 shuttle tub

Trunk floor is a scraper conveyor . Tub filled with the first front-end loaded, conveyor the material gradually move to the back-end loaded, continuously filled the tub, by the conveyor unloading. This tub large trunk capacity, high efficiency, due to round-trip shuttle as often as named.