The Northern line in London is for tubes or trains? Are there any underground trains on Northern line?

Question

The Northern line in London is for tubes or trains? Are there any underground trains on Northern line?

Answer 1

The Northern Line is part of Transport for London's Underground tube network (coloured black on the tube map).  It has quite a complicated network for an underground line. In the north it has three branches, one from Mill Hill East and the other from High Barnet which meet at Finchley Central. The other branch is from Edgware. These two branches meet at Camden Town, where the line splits again, one going via the city  (Moorgate and Bank) and the other via the West End (Tottenham Court Road and Leicester Square). These two branches rejoin at Kennington from where one line goes south to terminate at Morden. The line is now solely a tube line and only tube, underground, trains, can run on it. However, the Barnet and Mill Hill branches were originally 'overground' lines, being served by trains from King's Cross. Until the mass closure of small goods yards in the 1960s. goods trains ran over these branches, the Mill Hill one extending to Edgware goods depot. Until the early 1950s there were plans to extend the Mill Hill branch giving another route to Edgware and thence to Aldenham and also to include the then line to Alexandra Palace, but these plans were cancelled.

Answer 2

The London Underground network is really two independent systems.

The earliest lines were constructed by the "cut and cover" method, whereby the street was opened up, the railway constructed and then the street was re-built over the top. These lines were initially operated by steam trains and the tunnels are quite sizeable. These are the "true" Underground lines.

The later lines were built by tunnelling through the bedrock using a circular cutting shield. What you are left with is a long sausage-shaped tunnel, or a "tube". The tube lines have much smaller tunnels.

So, whereas a tube train can operate on an Underground line (such as happened on the East London Line in the 1970s), in general, the converse is not true.

However, where a tube line is wholly on the surface and completly seperate from the rest of the network (such as the Woodford to Hainault branch of the Central Line or the, now closed Epping to Ongar branch of the Central Line), then it is theoretically possible to operate Underground trains on a tube line. Non-tube trains operated on the Ongar branch for a number of years until it was electrified.

The Northern Line is a tube line and so only tube trains can operate on it.

Answer 3

Northern line is underground trains  called the tube by the shape of the tunnels