It was only in the 20th century that surface trains with diesel-electric locomotives known popularly as diesels, came into use.
Please correct the sentence.
It was only in the 20th century that surface trains with diesel-electric locomotives , known popularly as diesels, came into use. I just added a comma. Clive
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It was only in the 20th century that surface trains with diesel-electric locomotives, known popularly as diesels, came into use.
I just added a comma.
Clive