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The Modern Transit Society web site has moved. To obtain this page in the latest version, change "trainweb.org/mts" to "moderntransit.org" in the URL (web address). Below is an archived version (September 2005).

Page from the report "Preliminary Studies for an Additonal Bridge Across San Francisco Bay", California Dept. of Public Works, 3/31/47.

It states that "approximately half of all transbay passengers are carried in electric trains or busses." This figure is the total for both off-peak and commute times. My calculation is that during the critical commute periods, 2/3 of bridge users take electric trains.