After an interval, the train will arrive and pass B; as it does so, B sends " Train Entering Section " on the block bell to C . Then C acknowledges the bell signal and places the block instrument to " Train On Line ".
22.
This is a sophisticated system whose advantage is in handling densely trafficked lines; its complexity was a disadvantage and it was replaced in 1902 with Tyers single-wire three-position block instruments; the latter pattern was being installed on the newly widened double-track sections elsewhere on the route.
23.
In a simple double line configuration where the signal boxes are A, B and C in succession, the signal box at B will have two block instruments, one for trains in both directions in the section between A and B, and one for trains in both directions in the section between B and C.
24.
B immediately offers the train on to C by sending the " Is Line Clear ? " bell signal; if C accepts it he repeats the bell signal and places his block indicator to " Line Clear ", which moves the position of the upper needle indicator in B's block instrument to repeat that indication.
25.
On 16 May 1877 Major General Hutchinson inspected the extension, and criticised the absence of block instruments for signalling trains; there had been no decision by the Company on the method of working, and an undertaking was required from the NBR ( as intended purchasers of the line ) as well as from the Loanhead and Roslin Company.
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