(Updates with new death toll, details) GUWAHATI, India, June 25 (Reuters) - A train derailed in India's remote northeast on Monday, killing seven people, after a bridge on which it was passing collapsed, a railway spokesman said. Several cars of the train carrying rice fell off the tracks in the hilly Cachar district of Assam state, instantly killing the victims who were railway workers inspecting the tracks. "We do not know how the bridge collapsed, but it was an old one," spokesman T. Rabha said. "The death toll is now 7." Earlier the official had said 12 people died in the crash. Heavy monsoon rains in the hilly region frequently trigger landslides, snapping rail and road links. Many bridges across India's rail network, one of the world's largest, are several decades old with some having been built during British colonial rule more than 60 years ago.