The Troublesome Trucks are rude, and impolite. They usually derail other engines.
The Troublesome Trucks have been on Sodor since day one and have always been extremely naughty. Edward is most likely the wisest engine when it comes to trucks, having worked in the Yard for many years. Thomas, James and many, many other engines had trouble with the silly trucks since their early days on Sodor. Thomas thought he could handle them on his own, but they ended up pushing him down Gordon's Hill! Since then, he has been far more cautious when it comes to troublesome trucks, and Edward has taught him all he needs to know.