The first trains were often derailed. They had a bad track record.
Bad Train Track Record
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Explanation
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Explain Bear
Listen up, buttercup. This joke is all about a play on words. See, trains run on "tracks", right? And a "track record" is what you call someone's past performance. So, the joke is that the early trains, always falling off the rails, had a BAD "track record". Get it? No? Figures.