Yes, that is correct. You have answered your own question.
The function of hydraulic lines is to connect to the hydraulic system to carry either water, oil or any other form of liquid for that system. The hydraulic line is extremely important to the function of the system and works based on either a low or high pressure.
pons connect the brain and the central nervous system with a transverse band of nerves. they are helpful in controlling the respiration and moving the head as per audiovisual movements.
PBX systems uses PSTN lines to connect another PBX system over a long distance.
The underground railroad couldn't have a length, as it was not a physical structure, but a system of people and "stations" that was used in the mid 1800's to transport slaves to the north (as far as Canada after 1851) .
The english system is the metric system. There is no difference.
London Underground is a rapid transit system in London, England. Part of the system consists of underground tunnels.
The London underground system is usually referred to as 'the tube'.
The oldest metro system is London Underground
It is the subway system under London.
it is neither in underground or overground. it is a separate system.
London, England
London
London
The Tube.
London, England
The underground rail system in London is nicknamed 'the tube'.
Assuming you're talking about during the war - the London tube system provided an ideal shelter from the bombings - as they were deep underground.