Job lots are always a hit and miss thing, some are truly rubbish with a lot of trains only fit for scrapping and using as donors for parts, others are unbelievable bargains full of either working engines or engines with minor defects like a broken connector.
Mind you I'm one of these that even with the 'rubbish' lots I tend to get most of the engines working eventually, so far I've only really scrapped a couple and then it was due to things like broken chassis which is a bit difficult to fix without a donor. But even then I will strip all the usable parts off these models with a view to resurrect them in another engine which has another problem.
One of these days I've got to go through all my engines and start to sell off some of the duplicates, but its difficult as they are like my little children lol!!
Mind you I'm one of these that even with the 'rubbish' lots I tend to get most of the engines working eventually, so far I've only really scrapped a couple and then it was due to things like broken chassis which is a bit difficult to fix without a donor. But even then I will strip all the usable parts off these models with a view to resurrect them in another engine which has another problem.
One of these days I've got to go through all my engines and start to sell off some of the duplicates, but its difficult as they are like my little children lol!!
Happily collecting things all my life... 
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