Some model railway clubs are worth contacting in the event of the family railway modeller 'shuffling off this mortal coil', to quote Shakespeare. My own club provides a service where we will collect the railway items, value them at our clubroom and then sell them on, the owner being paid by cheques when items are sold. We deduct 15% commission for this service which is quite justified as the whole process is extremely time consuming. Avoid dealers at all costs, and that includes the big names in the hobby, who will offer paltry sums despite claiming to offer 'best prices' in their magazine adverts. I have personal experience of this and decided to sell instead via eBay resulting in my usually receiving the original purchase price or sometimes more, depending on the rarity value of the item. More often than not, the item usually sells for two or three times what the dealers are prepared to pay you.
Terry
Terry