Anyone looking for Quarry/Cement works/Mine Buildings might be interested in these plastic ones (look like they may be Walthers or similar) on Ebay UK, item number 371765365246 '00' gauge. Wish I'd seen these a while ago before I bought my Walthers cement works from Amazon! Usual disclaimers, as I have no knowledge of or connection with the seller, just thought these might be of interest! Keith.