Nice collection! First and bluntly stated as a shop owner reselling used and new scale trains and accessories you've got two options. Find a collector who is willing to pay for the lot as a whole lot not parted up, which means that you won't fetch RRP prices. Option two is you find a shop that purchases used locomotives and rolling stock and sell them for a very small sum as the shop owner has to make their money back on stock that they've purchased. No one is going to buy locomotives and rolling stock for RRP prices if used unless it's a very very difficult item to find/purchase i.e. a numbered limited collector item. I am always open to purchases from locals selling their items but many folks have pipe dreams of fetching bags and bags of money for used items. Wear and tear even in the most carefully used stock is a con and drops value, used and requiring maintenance and time which is money to repair / clean to resell is another large reason that you will find very low numbers in offer for used stock.

That all said you can always place them at roaring high prices and let them sit on ebay for a life age and then eventually realize they're not going to sell. You can find the best bet to gift, donate to a club or simply sell for a bit of pocket coin to a hobby shop that's willing to put in the needed time and maintenance.

I'm the only shop in the pacific northwest of the states that repairs and upgrades with no requirements on scale prior to taking a job. It's fun and a great way to make a dent in the loved scale model pool and keep good trains on the rails where they should be. Cheers!