Frichs is a Danish company based in Horsens, founded in 1854 in Aarhus. Frichs today produce ship engines but started out in the 19th century producing a long range of farm and industry equipment, ships, church bells, cranes and later through the 20th century locomotives and train carriages. In the early to mid 20th century it was a major company and employer in Aarhus at its height employing some 1000 people. The company was the sole Danish supplier of locomotives for the Danish State Railways from 1919 to the mid 1950s and sold locomotives across Europe and to Siam and New Zealand. In 1980 the company was sold to Kosan and then restructured and rebased to Horsens.

DSB, an abbreviation of Danske Statsbaner, is the largest Danish train operating company, and the largest in Scandinavia. While DSB is responsible for passenger train operation on most of the Danish railways, goods transport and railway maintenance are outside its scope. DSB runs a commuter rail system, called the S-train, in the area around the Danish capital, Copenhagen, that connects the different areas and suburbs in the greater metropolitan area. Between 2010 and 2017, DSB operated trains in Sweden.