We know that all current flow in loops, i.e. if they start at a source they must come back to the source. So for transmission lines, does the current that flow through our appliances in our homes go back to the generating station? If yes, how?
Transmission lines for our home appliances have multiple lines and the current return path is shared among these lines because in alternate current (AC) transmission, each line is a send and return path for current.
When it comes to transmission lines for trains, it is often seen that the ground send is one single line up in the air, while the return path is the train railway (and to some extent also the earth).