On the approach of a Train to either entrance, the Policeman on duty is to sound the Telegraph Bell, whereupon the Policeman at the other end will respond by sounding his Bell; and immediately after telegraph “Line clear,” or “Line blocked,” as the case may be.
If the answer be “Line clear,” the Train is to be allowed to enter the Tunnel, the Policeman at the entrance telegraphing back to the other end “Train in,” whereupon he will not again telegraph, or allow any Engine to enter the Tunnel, until he receives Telegraph Notice from the other end “Train out.”
The same process and precaution is to be observed with every Train that may arrive, and no Signal is to be considered received and understood until responded to.
Whichever end first rings the bell to announce the approach of a Train, that Train is to have the precedence, and a Train arriving at the other end is to be kept clear of the Crossing Points until the first announced Train has passed, when, after telegraphing “Train out,” and getting the response from the other end, the Policeman at that end will ring his bell as notice that he has a Train waiting to enter, which is to be allowed to proceed after passing the Signals as before described.
Three Policemen are also to be stationed in the Tunnel, with Fog Signals and Hand Lamps, to signal the Trains as they pass through; and one additional at each entrance, to assist in the Signals and crossing the Trains.
The Drivers are to be strictly enjoined to approach the Tunnel with caution, as a Train may be standing outside, and on passing through they are to be prepared to bring their Train to a stand, should it be necessary to stop unexpectedly.
H. P. Bruyeres.
London and North-Western Railway.
Superintendent’s Office, Euston Station,
30th August, 1848.
Relaying of the Up Line between Berkhampstead and Tring.