Looney Tunes - Boston Quackie (1957)

Boston Quackie is a 1957 Warner Bros. Looney Tunes short directed by Robert McKimson. The short was released on June 22, 1957, and stars Daffy Duck and Porky Pig. The cartoon and its title are a parody of the character Boston Blackie. The engine on the train is a 4-4-2 engine or a French Paris type steam locomotive No. 12 and 1434. These locomotives of this wheel arrangement were used most on France railroads. The shot where the train goes by shows the engine hauling four passenger cars, and when the train goes by the mail post, the engine only has three passenger cars.
The films is a spy comedy, featuring a secret agent who has to recover a stolen attaché case.