The Morse code heard in this cartoon translates as QST QSL 'LEON SCHLESINGER' HOLLYWOOD FOR PICTURE OF PORKY.
The name of the ship that Porky encounters at the drawbridge is the S.S. Leon, which is also the 1st name of the Producer of this cartoon.
The train names are a play on the ultra luxurious 20th Century Limited that ran between New York and Chicago.
Many years later, the basic theme of this film would be expanded on in the musical "Starlight Express" although the outcome would be the opposite... the steam trains would triumph over the futuristic models.
The sultry female fish that flirts with the Silver Fish is a spoof of Mae West.