The East Coast Main Line over which the 'Flying Scotsman' runs was built in the 19th century by many small railway companies, but mergers and acquisitions led to only three companies controlling the route; the North British Railway (NBR), the North Eastern Railway (NER) and the Great Northern Railway (GNR). In 1860 the three companies established the East Coast Joint Stock for through services using common vehicles, and it is from this agreement that the 'Flying Scotsman' came about.