You didn't think that red line running between San Francisco (4th & King) and San Jose (Diridon) was a BART line, did you?
For comparison, see the official BART System Map. And -- I take it you didn't realize it -- it includes a whole bunch more transit that isn't BART, including the Amtrak Capitols, ACE, Caltrain, Muni Metro, and VTA light rail. BART's own maps, if they ever show those forms of transport, tend to behave as if they're irrelevant.
And anyway the diagram style is very different -- LU-style maps have rules about never showing more than 45-degree bends, for instance. See the Wikipedia Article about the Tube Map for further discussion of this style.
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For comparison, see the official BART System Map. And -- I take it you didn't realize it -- it includes a whole bunch more transit that isn't BART, including the Amtrak Capitols, ACE, Caltrain, Muni Metro, and VTA light rail. BART's own maps, if they ever show those forms of transport, tend to behave as if they're irrelevant.
And anyway the diagram style is very different -- LU-style maps have rules about never showing more than 45-degree bends, for instance. See the Wikipedia Article about the Tube Map for further discussion of this style.