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Sounds like the A-10 of locomotives (ironically, Republic was known as the "Locomotive works" due to their planes being heavy). Built to do one specific job, and it did it well - if nothing in current production is able to do the job, then it's not obsolete.
That sounds a lot like the Class 37 in Britain. It is so track-friendly that on several lines it is the *only* permitted locomotive. Other traffic has to be DMUs (which have lighter axle weight than any locomotive). And they're about 50 years old...
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