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    Proto MAX(TM) metal knuckle couplers

    My recently purchased Walter's Proto 23,000 gallon tank car (UTLX #641639) came with Proto MAX(TM) metal knuckle couplers, which I think are Walter's version of Kadee #5's. I noticed the knuckle spring had fallen out of one of them, so I replaced it with a Kadee #148 whisker. I recently...




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