The squirrels jumped on the Great Western Railway (GWR) 8.54am train from Reading to Gatwick on Monday, forcing passengers to flee to other carriages.
The passengers alerted staff, who tried to lure the squirrels off the train at Redhill with snacks, before trying to force them off with brooms - but to no avail.
They subsequently called the journey off entirely.
This is my local line. To be honest the squirrels were probably just stunned that the train turned up in the first place.