Train passengers hoping to escape the horror of the weather today ran into a different terror altogether when Wellington Railway Station was over-run with zombies.

The zombie ''flesh mob'', organised by recreation group Adventure Wellington, stunned passersby at about 11am, with 120 zombies stumbling and lurching around the train station.

But to take things to the next level, the zombies then broke out in an undead version of popular song Gangnam Style, dancing in unison as their eyes rolled back in their heads.

Organiser Roy Hoogmoed said the group had been preparing since 8am for the flesh mob, applying fake blood and plenty of white face paint, and getting dance lessons from professional choreographers.

"It's just amazing to see so many people wanting to participate and be zombie for a day. The look on people's faces when the hordes arrived at the train station was priceless."

The flesh mob was organised as a lead-up to Adventure Wellington's even bigger zombie-themed event on October 27, when they will be hosting a fun run on Matiu/Somes Island.

The five-kilometre run will take place in the evening, with keen participants chased around the island by the hordes of zombies. All proceeds from the event will go towards Wellington SPCA.