[Tempest1981]

The tracks that Caltrain uses between San Francisco and San Jose are shared with Union Pacific freight trains, and that works.

Does anyone know what kind of freight Union Pacific hauls to/from San Francisco? Mostly late at night?

[toast0]

Last time I rode Caltrain, nearly all of the spurs to nearby buildings were blocked by fences, presumably trying to reduce 'trespasser incidents'. IIRC, UP would generally only operate on the tracks outside of the hours Caltrain was scheduled; and that's part of why Caltrain to Gilroy isn't scheduled often (there's a lot more frieght activity south of San Jose Diridon).