The Northern line is the tube line that has the most number of branches.
The Northern and Piccadilly lines are tube lines which have no branches at all.
There is a brake line vent tube on most Volvo trucks which allows excessive pressure to be released. This prevents catastrophic failure to the system.
The Circle Line is the Tube Line that did not call at the Kings Cross.
I guess robots and test tube babies. (not really)
The lungs are fed by one tube called the trachea (TRAY kee uh) This tube branches out into different levels of brachea (BRAY kee uh) which go to the two separate lungs.
The Central Line
The Jubilee Line
Most orifice tubes are placed in the high pressure line to the evaporator at the fire wall connection. You will have to empty the freon from the system to replace the orifice tube which is not very expensive (the tube, that is).
The Northern Line.
Central Line
The station is on the Jubilee Line
Charing Cross - Northern Line - tube crash happened in 1938.