Derby is a city located on the banks of the River Derwent and was traditionally the county town before it gained city status in 1977. Historically, Derby was settled by Romans and later still by Vikings. It later became known as a market town but it experienced growth during the industrial era. During the 19th century, Derby emerged as an engineering centre which still remains relevant to the economy today. In recent times, Derby is known for advanced transport manufacturing and is home to the world's second largest aero-engine manufacturing. It has notable productions such as Rolls-Royce and Toyota Manufacturing. These remain the two biggest employers in Derby. Other major industries include Core Design which produced the successful video Tomb Raider and the Derby railway station which retains an integral depot in the railway network.