The electric telegraph provided the ability for signalmen to communicate with each other and provided the basis for the absolute block system.
12.
A train's metal wheels and axles will pass current from one rail to the other, thereby shorting ( absolute block.
13.
Absolute Block signalling was withdrawn between Westerfield and Oulton Broad when the East Suffolk Line was upgraded to the Radio Electronic Token Block system.
14.
Absolute block is used all throughout Western Australia with exception to the Pilbara Railways as no information has been attained to cover that area.
15.
From 1876, when Absolute Block Working was introduced on the line, a second signal box was built to control the entry to Newbegin Colliery.
16.
The line was worked under permissive block regulations, but these were suspended when passenger trains were to work over the line and absolute block substituted.
17.
The MTDB replaced 40 % of all ties, cropped and welded the jointed rail, constructed electric catenaries, and installed an absolute block signal system.
18.
Although British railway operation is based solely on the absolute block principle, there are certain situations in which permissive signals are used to govern certain movements.
19.
This normally takes the place of an old absolute block section, and is commonly found where former absolute block sections and their associated signal boxes have been removed.
20.
This normally takes the place of an old absolute block section, and is commonly found where former absolute block sections and their associated signal boxes have been removed.
