That is amazing. Definitely take more pictures to preserve that history. But time marches on and save what you can. Brass is worth a lot. AT least I have not seen many cases where it isn't. The track, you won't get much for but if you can sell it at a train show, that should be good enough. Those circus items might have been kits by Wardie-Jay and if they were built nicely can be worth selling. Unbuilt kits are worth about 30 a piece. Nicely painted, could be more. Save all the boxes even if the item is built. Plasticville is hit or miss but if you see any that has marbled plastic, its gold. Don't underestimate anything even the smallest parts. I mistakenly tossed the small parts that connect the track with the thin center rail -name escapes me now. Ooops. Wiring and boards are probably the only thing for the dump.
I helped a realtor clear out a layout once. They just needed it cleared out and I was able to take whatever was not part of the house. But I had to bag up the garbage and the heir had removed the engines/rolling stock but I was able to harvest some great stuff. It took me a day and I filled up the SUV and its taking years to part with. Good situation for all really except my wife who was ****ed that I spent the day doing that. Wear masks when tearing this out. Its dusty and potential for some asbestos materials. Also bag it up and try to clean it outside before bringing it into your home. I might be interested in that coaling tower 
I apologize to anyone who finds this disgusting, abrasive or offensive. It just is what it is. Sad but true. Please keep us posted on the adventure.
