The machinery by means of which both draws and grade crossings can be protected, will be referred to in another connection,[7] meanwhile it is a curious fact that neither at grade crossings nor at draws has the mere stopping of trains proved a sufficient protection. Several times in the experience of Massachusetts' roads have those in charge of locomotives, after stopping and while moving at a slow rate of speed, actually run themselves into draws with their eyes open, and afterwards been wholly unable to give any satisfactory explanation of their conduct. But the insufficiency of stopping as a reliable means of prevention was especially illustrated in the case of an accident which occurred upon the Boston & Maine railroad on the morning of the 21st of November, 1862, when the early local passenger train was run into the open draw of the bridge almost at the entrance to the Boston station. It so happened that the train had stopped at the Charlestown station just before going onto the bridge, and at the time the accident occurred was moving at a speed scarcely faster than a man could walk; and yet the locomotive was entirely submerged, as the water at that point is deep, and the only thing which probably saved the train was that the draw was so narrow and the cars were so long that the foremost one lodged across the opening, and its forward end only was beneath the water. At the rate at which the train was moving the resistance thus offered was sufficient to stop it, though, even as it was, no less than six persons lost their lives and a much larger number were more or less injured. Here all the precautions imposed by the Connecticut law were taken, and served only to reveal the weak point in it. The accident was due to the neglect of the corporation in not having the draw and its system of signals interlocked in such a way that the movement of the one should automatically cause a corresponding movement of the other; and this neglect in high quarters made it possible for a careless employé to open the draw on a particularly dark and foggy morning, while he forgot at the same time to shift his signals. An exactly similar instance of carelessness on the part of an employé resulted in the derailment of a train upon the Long Branch line of the Central Road of New Jersey at the Shrewsbury river draw on August 9, 1877. In this case the safety signal was shown while the draw fastening had been left unsecured. The jar of the passing train threw the draw slightly open so as to disconnect the tracks; thus causing the derailment of the train, which subsequently plunged over the side of the bridge. Fortunately the tide was out, or there would have been a terrible loss of life; as it was, some seventy persons were injured, five of whom subsequently died. This accident also, like that on the Boston & Maine road in 1862, very forcibly illustrated the necessity of an interlocking apparatus. The safety signal was