If any of these cars lasted into the 1950's they would have been on branchline or mixed trains as these cars were wood sided, now a few were probably rebuilt either with steel underframes or steel sides over the wood and new underframes, but their short leingth not 70 ft. or 80 ft. would have had them out of service by then. Hey it's your railroad and you can run it any way you like so use them if you want. They are fairly nice cars. Nate Goodman (Nato).Salt Lake,Utah.