{"product_id":"3-inch-scale-simplicity-roller-stock-code-3476","title":"3 inch scale Simplicity roller","description":"\u003cp\u003eCoal-fired model of this unusual prototype roller by Wallis \u0026amp; Steevens of  Basingstoke, England. The original engines were very compact, weighing only 3  tons. Of the twenty originally built, 6 survive in preservation. The distinctive  diagonal boiler was intended to prevent low water level damaging the firebox  when in less than skilled hands. By the time the firebox crown was exposed,  there can only have been about a pint of water in the engine - as a further belt  and braces measure, the full size engines had a firebox that could be unbolted  from the rest of the boiler for quick replacement!\u003c\/p\u003e  \u003cp\u003eSilver-soldered copper boiler, working pressure 90psi, feed by injector and  mechanical pump driven from the second shaft - an auxiliary hand pump is fitted  on the footplate.\u003c\/p\u003e  \u003cp\u003eThe single cylinder engine has a slide valve actuated by Stephenson's  reversing gear - the flywheel is between the hornplates, along with the single  speed road gear and differential. The cylinder block is fitted with drain cocks.\u003c\/p\u003e  \u003cp\u003eA well made engine, it runs well.\u003c\/p\u003e  \u003cp\u003eLength 35 inches\u003cbr\u003e  Height 24 inches\u003cbr\u003e  Weight approx 150 pounds\u003c\/p\u003e  \u003cp align=\"center\"\u003e\u003c\/p\u003e","brand":"Station Road Steam","offers":[{"title":"Default Title","offer_id":54020206821717,"sku":"3476","price":3950.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1023\/0094\/2677\/files\/3476-1.webp?v=1779911782","url":"https:\/\/stationroadsteam.com\/products\/3-inch-scale-simplicity-roller-stock-code-3476","provider":"Station Road Steam","version":"1.0","type":"link"}