_C_ then throws his lever _Lʹ_ so as to place the home and distant signals _Sʹ_ and _Dʹ_ at safety. The condition of things will then be shown by Fig. 12. As soon as the last car of the train has passed over the treadle at _Gʹ_ his lever _Lʹ_ will be released and he can then throw the lever to the danger position, raising the home and distant signals _Sʹ_ and _Dʹ_ to the horizontal. After the danger position is assumed by the home signal _Sʹ_, as well as the distant signal _Dʹ_, he has no power over them until the signalman at station _C_ confers it on him by plunging the button _P″_. While the train has been in block 2, the indicator _Iʹ_ has shown “Blocked to _C_” and “Train on from _A_,” but as the train passes _B_ the indicator reads “Blocked to _C_” and “Train passed from _A_,” while the indicator _I″_ at _C_ reads “Blocked to _D_” and “Train on from _B_.” This condition of the signals and trains is shown by Fig. 13. Also, when the last car passes over the treadle _Gʹ_, but not till then, _B_ may permit _A_ to admit a train to enter block 2 should _A_ so desire. Finally, when the train approaches _C_, the signalman at that point asks _D_ to enable him to permit the train to enter block 4, and _C_ confers the power by plunging if that block is clear. Fig. 13 exhibits the corresponding signals at _C_. This sequence of operations is typical of what takes place in this particular block signal system at the limits of every successive block, and differs only in details characteristic of this system from those which are performed in any other block signal system. =279. General Results.=—It is seen first that no signalman can operate a signal until the condition in the block ahead of him is such as to make it proper for him to do so, and then he can only indicate what is necessary for the safe entrance of the train into that block. Furthermore, immediately on the passage of the train past his home signal he must put the latter to danger or the counterweight may do it for him, the train itself when in a safe position having conferred the requisite power upon him. The signalman at the advance end of the block always knows when the train is about to enter it, for he is obliged to give his permission for that entrance. His indicator shows this result, and will continue to show it until the train passes out of the block. It is to be observed that the upper openings marked _E_ on the indicator give information of the condition of the block in advance, while the lower openings give information of the block in the rear.