A man claimed he had acid as he threatened and racially abused a woman on a rail service between Gatwick Airport and Bedford, police have said.
Officers said a woman was on board a Thameslink service between the two stations when a man started to verbally abuse her at about 12.30pm.
The man threatened her with violence, claiming he had acid and implying he had a knife, and used racially offensive language, officer added.
The incident took place on September 21 and police have released details today (November 22) along with a CCTV image.
A British Transport Police spokesman said: “Officers believe the man shown in this CCTV image may have information which could help them investigate.”
Anyone with any information is asked to contact BTP by sending a text to 61016 or call 0800 40 50 40 quoting reference 1800069959.
You can also contact Crimestoppers anonymously on 0800 555 111.