An investigation has launched after a woman sleeping on a train from Polmont to Edinburgh woke up to find a naked man sitting next to her.
Police are investigating the incident, which happened last Thursday morning.
It happened on the Polmont to Edinburgh Waverley service at around 7:20am.
It's being treated as "public indecency".
The suspect is described as white, aged 65 to 70, and 5 foot 6 inches tall.