The municipal transporter system in San Francisco is shown in the Voyager episode 'Non Sequitur' to have a Mission District line:
This makes sense for train transit, like BART in today's San Francisco. However, this is stated to be a transporter system, presumably beaming people around the City. So why does it have lines? Do transporters have stops? The sign says 'Express Stop', but aren't all transporters express? How does a 'line' work in the context of transporter public transit?