Unknown date events

• The world's first railway viaduct
  Viaduct
  A viaduct is a bridge composed of several small spans. The term viaduct is derived from the Latin via for road and ducere to lead something. However, the Ancient Romans did not use that term per se; it is a modern derivation from an analogy with aqueduct. Like the Roman aqueducts, many early...
  
  , which became known as the "Covered Bridge", is built at Blaenavon
  Blaenavon
  Blaenavon is a town and World Heritage Site in south eastern Wales, lying at the source of the Afon Lwyd north of Pontypool, within the historic boundaries of Monmouthshire. The town lies high on a hillside and has a population of 6,349 people...
  
   in South Wales
  South Wales
  South Wales is an area of Wales bordered by England and the Bristol Channel to the east and south, and Mid Wales and West Wales to the north and west. The most densely populated region in the south-west of the United Kingdom, it is home to around 2.1 million people and includes the capital city of...
  
   for a horse
  Horse
  The horse is one of two extant subspecies of Equus ferus, or the wild horse. It is a single-hooved mammal belonging to the taxonomic family Equidae. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature into the large, single-toed animal of today...
  
  -worked tramway carrying coal
  Coal
  Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure...
  
   to the ironworks
  Ironworks
  An ironworks or iron works is a building or site where iron is smelted and where heavy iron and/or steel products are made. The term is both singular and plural, i.e...
  
   coke
  Coke (fuel)
  Coke is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coal. Cokes from coal are grey, hard, and porous. While coke can be formed naturally, the commonly used form is man-made.- History :...
  
  ovens. It is 40 m (131.2 ft) long with 10 arches and 10 m (32.8 ft) tall.