. The Locomotive . ed the cut-off for both cylinders with theusual arrangement of a rockershaft extending from one side of theengine to the other and this feature appears to have had a more orless prominent part in the cause of the engine running away. 1920. THE LOCOMOTIVE, 35 The leading cause of the accident was a sudden release of all loadfrom the engine by the breaking of the main driving belt which isthought to have been brought about by a piece of wood wedging be-tween the belt and the face of the wheel. The broken mam beltknocked off the governor-driving belt from its pulley so that the
. The Locomotive . ed the cut-off for both cylinders with theusual arrangement of a rockershaft extending from one side of theengine to the other and this feature appears to have had a more orless prominent part in the cause of the engine running away. 1920. THE LOCOMOTIVE, 35 The leading cause of the accident was a sudden release of all loadfrom the engine by the breaking of the main driving belt which isthought to have been brought about by a piece of wood wedging be-tween the belt and the face of the wheel. The broken mam beltknocked off the governor-driving belt from its pulley so that the gov-ernor stopped revolving. If the trouble had terminated there the direresults shown in the illustrations should have been averted by the so-called safety cams on the valve gear which come into play when thegovernor drops to its lowest position and prevent the further admissionof steam to the cylinders. However, as the big belt coiled up into thewheel pit, it broke the afore-mentioned governor rockershaft, which. General View of Cvlixders and Valve-gear. had the effect of preventing the safety cams on the north cylinder fromfunctioning so that this cylinder continued to receive steam during aportion of each stroke and the speed of the engine increased are advised that when the trouble began one of the operatorsran to the throttle valve wheel and succeeded in closing the valve towithin ys inch after which he ran for safety just in time to escapewith his life. This throttle valve was located overhead in the steam-line at the point where the steam-line forked into the two pipes thatled to the cylinders, and moreover, on each cylinder stood a spacious 36 THE LOCOMOTIVE. [April, steam separator so that the volume of steam between the throttle andthe cylinders was very large and in all probability was sufficient to runthe engine at a destructive speed, so that it is extremely doubtfulwhether his courage would have been crowned with success even ifhe had shut the valve t
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