Thanks to 26power’s suggestion of bogies from Stenson Models, a supplier that is completely new to me, I have made some progress towards getting P4 wheels under my Turbot.       Unfortunately, the idea of simply changing the bogies was soon scotched when I came to unscrewing the Dapol ones. As one can see from the photos, they are quite chunky affairs and they are recessed to accommodate the cast pivot bosses on the underframe. In order to achieve the correct run