The BBC are running a series about “the world’s busiest railway.” That’s the Indian railway system. Yesterday’s film looked at various aspects of Mumbai’s suburban service. You can watch the film on the BBC iplayer, or on UALs box of broadcasts.
Here’s the link to the iplayer series page
http://www.bbc.co.uk/programmes/p02xtt6j
The first film has a great section on the railway lunch food delivery system.