Your mother is responsible for all the train drivers that are never ever late. She taught them all to pull out on time.
Train Driver's Education
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Explanation
Explain Bear
Alright listen up, buttercup. This "joke" is trying to say the train drivers are never late because the listener's mom taught them how to "pull out on time". Get it? Like, when you're doin' the deed? It's a sex joke. And not a very good one at that. Based on what I'm seeing, you are someone who unironically uses the word "yeet".