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The three were assessed at the scene and one with minor head injuries was taken to Blue Mountains Hospital, an ambulance spokeswoman said. Paramedics initially had trouble reaching the site because fallen trees were blocking the roads, and the fire service had to be called in to clear debris, she said.

The CityRail train was heading west and was close to the Medlow Bath station when the tree fell across the carriage, a NSW police spokeswoman said. She said the uninjured passengers were transported on buses for the remainder of their journey.

In a separate incident, an eastbound XPT was also struck by a tree as it was travelling between Blackheath and Medlow Bath but no one was injured.