British Transport Police are investigating after a CCTV camera at Cwmbran rail station was damaged on Thursday, 15 November.
Officers have released CCTV images of a man they would like to speak to in connection to the incident.
Investigating officer PC Debi Rouse said: “Just after 9pm, a man was seen to cover the lens of the CCTV camera in the shelter on platform 1 before proceeding to damage it.
“This is nothing other than wanton destruction carried out by a person who clearly has no respect for their surroundings or the property of others.
“This was a reckless act of mindless criminal damage which could have put innocent people in danger.”
Having viewed CCTV footage prior to and during the incident, officers have identified a man they believe may have key information.
He is described as in his early 20s, around 5ft 8in, of medium build, and clean shaven with short, dark hair. He was wearing a dark jacket and light trousers.
“We have circulated the image to local police forces and rail staff in an attempt to obtain a name for this individual, but have had no success so far,” said PC Rouse.
“I would now urge any witnesses or anyone who recognises this man to contact us, as I believe he will be able to help us with our enquiries.
“Also, the man we would like to trace was seen with a woman around the same age, who is described as slim with long hair.
“Were you this woman, or do you know who she may be? If so, we would like to hear from you.”
If you recognise the man in the images, or have any information that could assist police with their enquiries, call 0800 40 50 40 quoting background log B5/WHA of 06/12/2012. Alternatively, call Crimestoppers anonymously on 0800 555 111.