Why didn’t the train kill nine families of four?
Because he had no loco-MOTIVE. AHAHAH
Loco-Motive
Explanation
Explain Bear
Listen here, you silly goose! The joke is a play on words. "Loco-MOTIVE" sounds like "locomotive," which is a type of train. The train didn't do the bad thing because it lacked a "loco-MOTIVE," get it? Now go back to watching your cartoons!