Robot Trains (2015)

S1E21 The Secret of Alpha Train

Kay hears Stella’s tale about a legendary train known as the Alpha Train. She cautions him that impending darkness is on the horizon. Skeptical at first, Kay's doubts begin to fade when Victor reveals evidence of the Alpha Train's reality—its cargo has mysteriously arrived in Area V. He elaborates to Kay how Area V managed to endure after being severed from the Fountain Plaza's influence.