Who Was On The Train Again?

Riddle: A train was full of couples. The train crashed and every single person died. How many people survived?

Answer: Everyone, there were only couples on the train, no singles.

Source: https://www.riddles.com/index.php/10717

A train was full of couples. The train crashed and every single person died. How many people survived? — Who Was on the train again? by Rocket Crafters v1.

Riddle: A train was full of couples. The train crashed and every single person died. How many people survived? Answer: Everyone, there were only couples on the train, no singles. — by Rocket Crafters v2.