Take it from me. Modern diesel engines — especially when they are properly maintained — are perceptibly cleaner than their predecessors. Besides the accompanying picture of a far-from-clean Seddon Pennine in Galashiels, one example of bad old diesels sits vividly in my recent memory. It was spring 1995 and my wife and I were sharing a cottage in the Yorkshire Dales with a couple from Norway. We took them for a day in York and, being the public transport-minded citizen that Iam, we left the car in a park-&-ride site and caught the bus into the city centre. This may only have been 10 years ago, but it was in the days before there were more than odd handfuls of low-floor buses and FirstGroup had yet to be invented.
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