One of Australia's cutest animals surprised Queensland Rail staff when it paid a visit to an urban rail station.

Dubbed "Percy the Platypus", the brown critter was found in a stormwater drain in Caboolture early on Wednesday morning.

Private security guard Anna-Maria spotted the small brown "furry passenger" in the drain during her regular patrols.

A Queensland Rail train controller affectionately gave the platypus his name, before scooping it up and taking it to Australia Zoo for care.

The rescuer was working nightshift at the time and therefore was unable to chat to the ABC about the experience today.

Australia Zoo said the juvenile platypus was given the once over by staff at the wildlife hospital and was unharmed in the train station ordeal.

Percy was released in the Caboolture area at a creek known for housing platypuses shortly afterwards.

He was the second platypus brought to the zoo's Sunshine Coast hospital this year.

"Although platypuses are not necessarily harder to treat than other wildlife, due to their elusive nature platypus are often only found by rescuers when their health has deteriorated over time and they're particularly unwell," Doctor Rosie Booth said.

Private security guard Anna-Maria spotted the small brown "furry passenger" in the drain. ( Supplied: Queensland Rail )

Percy the platypus was released back into the wild, unharmed. ( Supplied: Queensland Rail )