Thomas was angry that he had to pull the Troublesome Trucks by himself because Mavis and Diesel left him to do it on his own and they haven't come back like more than a minute or so. Yes this is a reference to Thomas and Friends season 18 episode nine called Thomas The Quarry Engine where Thomas is doing all the work by himself. While Diesel shows Mavis all of the places around The Island of Sodor. Thomas was being impatient of waiting for Mavis and Diesel to come back.