The indication " line blocked ", the default position for block instruments, was displayed through one half of each of the other two indications being displayed in the window.
12.
In 1862 Spagnoletti patented and produced the Spagnoletti disc block instrument, first used on the Metropolitan Railway when it opened in 1863, and which soon became standard on the GWR.
13.
This occurred before the S & DJR was equipped for token working and was relying on block instruments only-a catalogue of errors led to two passenger trains entering the same section from opposite ends.
14.
In 1951 a rear-end collision took place at Stobcross; a signalman worked the block instruments irregularly, and there were two wrong-side defects in the lock and block system that enabled this.
15.
The block instrument consists of a small cabinet; its front face displays two indicators telegraph needles and has a commutator handle ( some early designs of block instruments had miniature semaphore arms instead of needles ).
16.
The block instrument consists of a small cabinet; its front face displays two indicators telegraph needles and has a commutator handle ( some early designs of block instruments had miniature semaphore arms instead of needles ).
17.
The "'signalling bell "', also known as a "'block bell "', is used in conjunction with the block instruments if the bell is not integrated with them.
18.
In the late 1920s responsibility for the station was passed to the Stationmaster at Otterham, and in 1930 the block instruments were moved from the signalbox to the Booking Office under the charge of a porter-signalman.
19.
If the signalman at B can accept the train safely ( see below ) he " accepts " the train by repeating the bell signal, and placing the commutator on his block instrument for the section from A to " Line Clear ".
20.
In this block instrument, a disc, instead of a telegraph needle, oscillated between a pair of electromagnets to indicate " line clear " or " train on line " in a window at the bottom of the instrument's face.
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