from the T Transit Updates page:
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IMPORTANT INFORMATION
FOR WORLD SERIES CELEBRANTS
It is anticipated that millions of fans will attend the celebration of the Boston Red Sox World Series victory in Boston on Saturday October 30, 2004.
First and foremost, if the predictions are near accurate, it is likely to be the busiest day in the history of Commuter Rail, creating extraordinary demand on the system. It is expected that it will be anything but “business as usual” for all modes of transportation.
Commuter Rail will operate trains on a Saturday schedule that will be supplemented with additional service where possible. Crowding and substantial delays are expected.
Tickets
Customers who do not have tickets are reminded to purchase round-trip tickets on the inbound trip.
Parking
Route 128 Station (Exit 13 on Route 128)
Anderson Regional Transportation Center (exit 37 on Route 93)
Thousands of parking spaces are available at these parking facilities. Shuttle trains will be provided in the morning and afternoon to accommodate customers who park at these locations.
Outbound Departures
Although trains will be operated as close to schedule as possible, when trains at North Station and South Station are full they will depart, even though the departure may be ahead of the scheduled time.
North Station
Due to the limited capacity at North Station, four areas will be created outside of the station for the boarding of trains, one area for each Line.
# The Newburyport/Rockport Line and the Haverhill/Reading Line areas will be located on the right side of the station when looking at the Fleet Center from Causeway Street (also known as Accolon Way).
# The Lowell Line and Fitchburg/South Acton Line areas will be located on the left side of the station when looking at the Fleet Center from Causeway Street (also known as the “West Entrance”).
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and also this:
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Extra trains to and from Salem, MA on Saturday October 30, 2004 will not be operated on the schedules originally announced because of the anticipated millions of fans that will attend the celebration of the Boston Red Sox World Series victory in Boston on Saturday.
There will be extra service on Saturday, October 30, 2004, which will be operated in conjunction with the expected overflow crowds attending the victory celebration. The extra service to and from Salem, MA will be operated as trains become available.
Regularly scheduled trains will operate as usual.
Fares on the extra trains will be the same as those on the regularly scheduled trains.
Extra service will be provided to and from Salem, MA on the Newburyport/Rockport Line on Sunday, October 31, 2004 on the schedules displayed below.
[I'm omitting the rest since the 10/31 schedule isn't relevant to this topic]