Mixed Signals

"Mixed Signals" is the sixth episode of the first season.

Plot
Thomas loves his branch line when he travels the big harbor, where Thomas' little tank engine sister, Percy is talking to his two twin engine brothers Bill and Berry. She tells Thomas about mixed signals. Bill and Berry have an brilliant idea to shunt freight cars in the station yard. The next day they need drink, but the water tower is out of order, so they their crew decide to fill china clay. Percy enjoys it, soon gets a pain in her boiler. She puffs in a siding feeling as if her boiler is about to burst. The conductor telephones for an engine inspector, and surrounds Thomas and Percy with warning signs that say "Danger, Keep Away". The Inspector and the Fat Controller soon find the cause of the problem - Thomas and Percy's drivers and firemen have unloaded china clay with the water. Bill and Berry