Police are investigating an incident in Epping which occurred earlier this month.
Investigators believe two men sprayed graffiti on stabled trains at Cooper Street, Epping about 10.40am on 9 July.
The first offender is perceived to be Caucasian in appearance with a thin build, collar length blond hair.
He was wearing a grey baseball cap, orange and blue hi-vis coat, green trousers, black runners and sunglasses.
The second offender is perceived to be Caucasian in appearance with dark hair and stubble facial hair.
He was wearing an orange hi-vis vest with a black jacket underneath, tan pants, Adidas runners and a black beanie.
Police have released images of two men they believe can assist with their enquiries.
Anyone with information or who recognises the men is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report at www.crimestoppersvic.com.au