Nicole Kidman filming a train scene from the movie 'The Railway Man' in Scotland on May 2, 2012 Credit:

Somber movie, serious hair.

Nicole Kidman was spotted on the set of her new movie, The Railway Man, wearing a short brown wig in Perth, Scotland Wednesday.

The dowdy 'do, which is a total departure from the Aussie actress' famous strawberry blonde hair, is for the actress' role alongside Colin Firth in the true story film about a Scottish second lieutenant who was captured by the Japanese in Singapore during World War II.

"This isn't just a portrait of suffering," Firth said of the drama. "It's a very, very specific story about how that kind of damage interacts with intimate relationships, with love."

A far more glamorous looking Kidman, 44, recently hit the red carpet at the Academy of Country Music Awards with husband Keith Urban.

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