rolley

A rolley is a low, robust cart designed to run on tramway rails inside a mine, typically pulled by pit ponies or horses. The vehicle consists of a wooden or iron platform mounted on iron wheels sized to fit the mine's track gauge, usually between 2 feet and 2 feet 6 inches. Its primary job is moving extracted coal, ore, or waste rock from the working face to the surface shaft or underground distribution point, where the load transfers to larger hoisting equipment.

The frame is deliberately simple and sturdy to withstand repeated impacts and the vibration of underground haulage. Rolley wheels are flanged to grip the rails securely on uneven, wet tracks. The cart carries no brakes in most designs, relying instead on the strength of the pit animal to hold it back on grades, or on pinch bars operated by the teamster to lock the wheels. Some rolleys had a small raised edge or lip around the platform to prevent cargo from sliding off on turns or inclines.

Design and capacity varied by pit and era. Smaller rolleys might hold 8 to 10 hundredweight of coal; larger ones in iron mines could carry twice that. Some rolleys had a tilting mechanism allowing the teamster to tip the load sideways directly onto a larger bin without manual unloading. Others were fitted with a hook or chain attachment at one end so multiple carts could be coupled together and hauled as a train by a single powerful horse.

The term is most closely associated with British coal and metal mines of the 19th and early 20th centuries, though similar vehicles appeared in mines across Europe and North America under different regional names. As mechanical haulage systems and electric locomotives displaced horse working underground, rolleys became obsolete. The word itself may derive from the wheels' rolling motion, though some sources suggest a connection to "trolley," a related term for rail-mounted equipment.