Slate wagons are specialized types of

railway wagon A railroad car, railcar (American and Canadian English), railway wagon, railway carriage, railway truck, railwagon, railcarriage or railtruck (British English and UIC), also called a train car, train wagon, train carriage or train truck, is a ...

s designed for the conveyance of

slate Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock. ...

. The characteristics of this stone led to the development of small open cars that carried the slate in its various forms. These were first developed on the

narrow gauge railway A narrow-gauge railway (narrow-gauge railroad in the US) is a railway with a track gauge narrower than standard . Most narrow-gauge railways are between and . Since narrow-gauge railways are usually built with tighter curves, smaller struct ...

s serving the

slate industry The slate industry is the industry related to the extraction and processing of slate. Slate is either quarried from a ''slate quarry'' or reached by tunneling in a ''slate mine''. Common uses for slate include as a roofing material, a flooring m ...

North Wales North Wales ( cy, Gogledd Cymru) is a regions of Wales, region of Wales, encompassing its northernmost areas. It borders Mid Wales to the south, England to the east, and the Irish Sea to the north and west. The area is highly mountainous and rural, ...

in the late 18th century. They were initially used on

horse-drawn A horse-drawn vehicle is a mechanized piece of equipment pulled by one horse or by a team of horses. These vehicles typically had two or four wheels and were used to carry passengers and/or a load. They were once common worldwide, but they have m ...

tramways, but survived with only minor modifications into the days of

locomotive A locomotive or engine is a rail transport vehicle that provides the motive power for a train. If a locomotive is capable of carrying a payload, it is usually rather referred to as a multiple unit, motor coach, railcar or power car; the ...

s and are still to be found in use in the 21st century.

Types

The three most common types of slate wagon are:

Slate wagon

This is the basic vehicle for transporting

roofing slate Roofing slates are stone slabs made out of slate, which are used as roofing tiles. They are the primary product of the slate industry. See also * Slate#Slate in buildings * Slate industry * Stone slabs#In construction * Roofing material ...

s from the

quarry A quarry is a type of open-pit mine in which dimension stone, rock, construction aggregate, riprap, sand, gravel, or slate is excavated from the ground. The operation of quarries is regulated in some jurisdictions to reduce their envir ...

to the destination. Because roofing slates are relatively

friable Friability ( ), the condition of being friable, describes the tendency of a solid substance to break into smaller pieces under duress or contact, especially by rubbing. The opposite of friable is indurate. Substances that are designated hazardous, ...

, they are packed vertically into the open slate wagons to reduce the chance they will be broken on their journey. Early designs used simple wooden rails to hold the packed slates. Later these were replaced with iron or steel railed examples of a similar design.

Slab wagon

Slab wagons are designed to carry large uncut slabs of slate, often internally within quarries. The most common form is flat wagon (often referred to as a ''sled'') where the slab is laid horizontally on wooden runners and chained to the wagon. A less common form is the vertical slab wagon, where two slabs are chained to an A-frame mounted on the wagon; this form of slab wagon was most famously used on the

Corris Railway The Corris Railway ( cy, Rheilffordd Corris) is a narrow gauge preserved railway based in Corris on the border between Merionethshire (now Gwynedd) and Montgomeryshire (now Powys) in Mid-Wales. The line opened in 1859 as a horse tramway, runni ...

though other lines such as the

Ffestiniog Railway The Ffestiniog Railway ( cy, Rheilffordd Ffestiniog) is a heritage railway based on narrow-gauge, located in Gwynedd, Wales. It is a major tourist attraction located mainly within the Snowdonia National Park. The railway is roughly long a ...

also had examples of this type.

Rubbish wagon

These were used almost exclusively within slate quarries. They transported waste slate from the mills to the dumps. These were often crude vehicles that were heavily abused during service. They typically consisted of a basic flat wagon with a three-sided iron body that held the waste. The waste slate was usually tipped from the wagon onto the slate tips, usually by physically tipping the entire wagon and its contents.

References

{{DEFAULTSORT:Slate Waggon Freight rolling stock British railway wagons Slate industry