Hollywood star Angelina Jolie and co-star Dan Futterman walk on a railway platform as they shoot for the film "A Mighty Heart" in Mumbai, November 13, 2006.

Hollywood star Angelina Jolie caught passengers of a packed commuter train unawares in India's financial hub of Mumbai on Monday where she shot for a film on a slain American reporter.

Jolie, filming in India for almost a month with partner Brad Pitt, bought tickets from a city station and boarded a crowded compartment of a Mumbai train with co-actor Dan Futterman.

A Reuters photographer on the train said disbelieving passengers jostled for a view of the sultry actor -- wearing a green T-shirt and khaki trousers -- but were kept at bay by four of her bodyguards.

Passengers brought out pens and paper for autographs, but they were not allowed near Jolie. There was no police security for the shooting.

Jolie plays the wife of Daniel Pearl, an American journalist who was kidnapped and murdered in Pakistan in 2002, in the film "A Mighty Heart". Futterman plays the reporter in the film which is being produced by Pitt.

Suburban trains are Mumbai's lifeline and are used by some six million commuters every day, many of whom travel by hanging from the door-less coaches during rush hour.

Mumbai's teeming railway network was the target of a terror attack in July when bombs went off on packed evening rush hour trains and platforms, killing 186 people and wounding about 700.