[...]
In 2002, academics at the Indian Institute of Management and the LSE conducted a
study on escalator capacity. Behaviours can change capacity (see Holborn’s foolish
experiments with banning walking on the left), but basically, on the London Underground, you can move 110 people per minute (ppm) on one standard escalator: that’s 6600 per hour.
The shiny nine car class 345 trains ordered for Crossrail have a capacity of 1500 people. Crucially, the platforms have been built long enough to extend this to 11 cars, for a potential capacity per train of around 1,800. Crossrail is planning for 24 trains per hour (tph), but the line was designed for 30 tph to be possible. Once those changes are brought into use, and with trains in two directions, that gives us a maximum number of people passing through a central Crossrail station at peak time of 108,000.
It’s not likely that everyone is not going to get off every train at one station except in an emergency. But at peak times, the idea that half the passengers on a train might get off at key stations – Liverpool Street, say – does not seem unreasonable. After all, from the east this service replaces the Shenfield metro, so many people will have commutes planned around alighting at that station; and from the west, Crossrail will be far the fastest and most pleasant route into the City. [...]