Caltrain Simp Share definition Flag A simp for Caltrain, usually pretty stupid. Metra Person: Fuck Caltrain Simps!Some other train person: I agree with this statement. Caltrain Simp by Caltrain Sucks February 23, 2021 0 0 Get merch Get the Caltrain Simp mug. Buy Now — $32.95 See more merch