The Railway Series
Once, Gordon was pulling the express when he was stopped on the bridge by a cow named Bluebell. Henry, both crews and the passengers tried to move her, but to no avail. Eventually, a porter brought her calf (who was ready to go to market) to lure her off of the bridge.
Thomas & Friends
Just like in the Railway Series, Bluebell was looking for her calf on the bridge and blocked the line. She scared Gordon and Henry, with the latter returning to the station. Percy was then dispatched to the bridge to bring her calf, with the porter leading them away.