This game is theoretically set at the Inbound platform of the Harvard Square T station, albeit a simplified version of it. This is a fairly ordinary subway station: red tile lining the walls, mostly a single platform about ten feet wide and fifty feet long with a five-foot-deep pit along one side, with the train tracks at the bottom of the pit. There is a yellow line about a foot from the pit. There is a single entrance/exit to the platform, with several turnstiles. The attendant sits in a booth next to the turnstiles, dispensing T tokens, which cost a dollar each. The security guard is sitting just inside the turnstiles.
The T is running very badly today -- the trains have been taking three times as long as usual, and are therefore all incredibly full. No one knows exactly why.
I suggest laying yellow tape down on the floor to represent the yellow line, and black tape to represent the edge of the pit. If someone falls into the pit for whatever reason, they will need assistance to clamber out. You might put a second line of tape about four feet further on, to represent The Third Rail -- if someone touches The Third Rail, they are dead. Drop a few Mouse item cards into the pit, just because.
Chairs are always useful tools. Set up a row of chairs to represent the turnstiles (you have to climb over the seat of the chair to go through the turnstile). Use a couple of chairs to represent the attendant's booth. The attendant is behind bulletproof glass. Next to the attendant is a special gate which s/he may open at his/her discretion. (This is supposed to cost the usual $1 to enter through.)
The game starts just as the previous train is leaving. All players can hear it leave.
At game start, all of the Loiterers are already on the platform. All Passengers are outside the turnstiles except as noted otherwise. Any Passengers who have T Tokens may enter through the turnstiles by paying one token; others must buy tokens.
After about ten minutes (exact time at GM discretion), the next train arrives. Make train noises, and set up a few chairs to represent the train. All cars on the train are packed as tight as sardines, except for one, which has enough room for about ten people. Set up the chairs so that the opening is only large enough for about ten.
When the doors open, people will presumably try to push in. Constrain them to the specified space. The doors should close about thirty seconds later. The doors cannot close until they are completely clear -- if anyone is blocking the doors, make an announcement that "The doors cannot close until all passengers are completely inside. Please clear the doors." Repeat as necessary, getting more annoyed as you do so.
The game ends once the doors close and the train leaves the station.