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It seems like there's a general agreement that the "first generation" of diesel-electric locomotives consists of the original diesels that replaced steam engines in the 1930s-1950s while the "second generation" consists of the boxy-looking types (pic related is a classic example) that started showing up in the 1960s to replace the first generation.
After that, it starts to get murky.
How do you define the "generations" of diesels, and where do you think we are now?
