With respect to your comment of what's a reasonable price. These sets go for upwards of $700 on the secondary market when they include the separately sold add-on reefer. And this includes recent York meets where if a deal is to be had, York would be the place to find it. When you state you found a set online, if you are referring to the set currently on ebay which includes the add-on reefer all for $600 I would jump on that now even though it's missing the ladder on the back of the engine. That is a very reasonable price point compared to what I have seen the last few years plus it's being sold by a reputable shop with great feedback. Sure, you may find one cheaper at some point, but if you really want the set, now would be the time to buy.
-Greg