Beyer Garratt on the High Street ! The flashing roadway warning lights make more noise than the locomotive. Number 143 departs Porthmadog over the Britannia Bridge heading for the Welsh Highland Railway terminus at Caernarfon on the North Coast. Immediately behind the Garratt is the new WHR Pullman observation saloon completed by Boston Lodge Works in 2009, complete with large wrap-around glass window on the rear.