Data to which the Department has access is limited to Passengers in Excess of Capacity (PIXC), a measure which applies to weekday commuter trains arriving in London between 7 am and 9.59 am and departing London between 4 pm and 6.59 pm.
The Office of Rail Regulation (ORR) publishes PIXC figures in its National Rail Trends publication. The most recent edition, covering 2005, was published on 5 July 2006.
The document is on the internet at the following address: http://www.rail-reg.gov.uk/upload/pdf/294.pdf and has been made available in the Library of the House.