Schenker freight train was derailed near the site of station, on the Lincoln-Grimsby line. Types of train The line is operated by Northern Trains, which mainly utilises Class 150 sets (though Class 153 single railcars can also appear). From Gainsborough Trent Junction (where the line from Doncaster joins) eastwards to Lincoln, class 153 and Class 156 units operated by East Midlands Railway share the route. The Brigg route is also used by freight traffic between Immingham docks and the power stations at West Burton, Cottam (after reversing in Worksop sidings) and West Yorkshire & the East Midlands. Retford dive-under The Sheffield and Lincolnshire Junction Railway (S&LJR) (later Great Central Railway (GCR), now the Sheffield–Lincoln line) was the first railway in Retford, arriving on 6 July 1849. This was then joined by the Great Northern Railway (GNR) line from , arriving on 4 September 1849 with the GNR crossing the S&LJR at a flat crossing. This flat crossing caused congestion as trains could not run on both lines at the same time; this was to become a bigger problem when the West Burton and Cottam power stations were built, as they would require 5 million imperial tons (approx. 5 million tonnes) of coal a year, to be sourced from the National Coal Board's coalfields in the East Midlands and North East. The flat crossing also placed a speed restriction on express trains using the GNR line. In order to alleviate these problems a dive-under was constructed, by which the GCR passed under a new bridge which the GNR passed over. Construction started in 1963 and was completed in 1965. During construction, trains continued to use the flat crossing. Upon completion of the dive-under the flat crossing was finally removed on 13 June 1965, allowing through trains on the GNR to run at normal operating speeds, and allowing trains to run on both lines simultaneously. The approach slopes into the dive-under's long channel have a gradient of 1 in 100 on the east and 1 in 133 on the west side. References Rail transport in Nottinghamshire Rail transport in Lincolnshire Rail transport in South Yorkshire Rail transport in Sheffield Lincoln, England Railway lines in the East Midlands Railway lines in Yorkshire and the Humber Standard gauge railways in England