Who is Mr. Trent from The Great Train Robbery and what is their importance?

Mr. Trent is the president of the bank that provides the gold for payment to the soldiers in the Crimean War. He is described as a strict man, who lives by a strict routine. Trent, however, has one habit that stands out from his usual routine, he enjoys dog and rat fights. This provides Pierce with a way to get close to Trent and learn where Trent hides one of the keys to the Chubb safes that contain the gold on the train.