Transit Crime Investigation Unit detectives are investigating an assault at Flinders Street Railway Station last month, Victoria Police say.
Investigators have been told a male tried to steal a packet of chips from a platform kiosk about 3.15pm on 12 February.
The store attendant confronted the male and took the packet of chips back before the male removed a machete from his backpack and swung it at the attendant.
The attendant managed to dodge the blade without being hit.
The male and a female associate boarded a Sunbury bound train shortly after.
Detectives have released images of a male who they believe may be able to assist with their enquiries.
Anyone with information is urged to contact Crime Stoppers.
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