Bradway Tunnel, 2027 yards (1,853.5 m) long, was built in 1870 about 1 miles (1.6 km) north of Dronfield, Derbyshire

Dronfield railway station

Dronfield railway station serves the town of Dronfield in Derbyshire, England , south of Sheffield, on the Midland Main Line between Chesterfield and Sheffield....

, in South Yorkshire

South Yorkshire

South Yorkshire is a metropolitan county in the Yorkshire and the Humber region of England. It has a population of 1.29 million. It consists of four metropolitan boroughs: Barnsley, Doncaster, Rotherham, and City of Sheffield...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

.

It is at the summit of the Midland Main Line

Midland Main Line

The Midland Main Line is a major railway route in the United Kingdom, part of the British railway system.The present-day line links London St...

 between Chesterfield

Chesterfield railway station

Entrance to the station is on Crow Lane and includes a car park, taxi rank and bus stop. There is also a small car park on the other side of Crow Lane which does not have a parking charge. The main entrance leads to the station concourse, which is very spacious and was built in the late 1990s. It...

 and Sheffield, on what is known to railwaymen as the "New Road" built by the Midland Railway

Midland Railway

The Midland Railway was a railway company in the United Kingdom from 1844 to 1922, when it became part of the London, Midland and Scottish Railway....

 to serve Sheffield, which was bypassed by the North Midland Railway

North Midland Railway

The North Midland Railway was a British railway company, which opened its line from Derby to Rotherham and Leeds in 1840.At Derby it connected with the Birmingham and Derby Junction Railway and the Midland Counties Railway at what became known as the Tri Junct Station...

's "Old Road" due to the gradients involved. During its excavation a number of small heading tunnels were needed to drain some 16,000 gallons of water an hour.

At the north end is the triangular junction with the Hope Valley Line

Hope Valley Line

The Hope Valley Line is a railway line in England linking Sheffield with Manchester. It was completed in 1894.From Sheffield, trains head down the Midland Main Line to Dore, where the Hope Valley Line branches off to run through the Totley Tunnel .It emerges in the stunning scenery of the Hope...

 and Dore station

Dore railway station

Dore and Totley railway station is a small, one platform railway halt near the Sheffield areas of Dore and Totley in South Yorkshire, England...

. Northwards the line proceeds down a 1 in 100 gradient, through the abandoned Beauchief, Millhouses and Heeley stations, into Sheffield Midland station

Sheffield Midland station

Sheffield station, formerly Pond Street and later Sheffield Midland, is a railway station in Sheffield, England and is the busiest station in South Yorkshire...

.

• North western portal: 53°19′19"N 1°30′35"W
• South eastern portal: 53°18′45.3"N 1°29′11.6"W