Board Thread:Questions and Answers/@comment-86.6.199.105-20131126234321/@comment-15636815-20131127031649

I don't think we have a handy list of just the XP waggons that you need. However, if you click on each contractor's link at the top of the page, you can see which waggons each contractor will request.

I recently cleaned out my Storage of old stuff, like those XP waggons. You can sell safely anything that's in the Buyback Shop, even if a contractor needs it later. You also can sell safely anything in the regular Shop, although you will take a loss when you sell and rebuy. And of course, you want to keep the waggons with the highest bonuses. You'll have to decide for yourself which ones are too low to keep.