Funnels and Tunnels is a magazine story.
Daisy is moaning because every time she goes through the tunnel Thomas or Percy had just been through, their smoke and soot lingers in the tunnel and gets Daisy filthy. The Fat Controller changes the timetables so Daisy goes through the tunnel first. However, one day Daisy breaks down in the tunnel and in the time she is in there, all the dirt falls on her and ice-cold water leaks from the tunnel's roof. She is soon rescued by Thomas.