The Three Unknown Engines/MADTV

At The Start Of The Mad TV Parody "Thomas The Unstoppable Tank Engine" We Can See The Island Of Sodor With Three Tank Engines. We Are Unable To See Crystal Clear Who These Tank Engines Are, But We Can Make Good Guesses.

The Blue Tank Engine
The Blue Tank Engine Has The Same Shape As Thomas, But It Cannot Be Thomas Considering that The Next Scene We See Thomas Getting Repaired At Knapford Station. The Only Other Engine (That Works On The Standard Gauge Lines On Sodor) Is Belle

The Red Engine
The Red Tank Engine Also Has The Same Body As Thomas. The Only Standard Gauge Tank Engine On Sodor Is Arthur. So This Must Be Arthur

The Black Tank Engine
The Black Tank Engine Has The Same Shape As Thomas Still. The Only Black Tank Engine On Sodor That Looks Close Is Jinty.