Earlier types of electro-pneumatic semaphores made by US & S had seen some limited application by 1880 as automatic block signals.
32.
Home, starting and block signals on Japanese railways are usually lights composed of three colors ( green, yellow and red ).
33.
Cabs in cities would be ideal sources were it not for the tendency of tall buildings to block signals from the satellites.
34.
Each block signal is identified by an identification number; as a train travels to the next station, the ID numbers count down.
35.
On the westbound tracks, the signal in the south of the platform for Amagasaki is not the entering signal but block signal 0.
36.
The need to maintain air pressure in the long pneumatic lines eventually led the railroads to discontinue their widespread use as automatic block signals.
37.
The MTDB replaced 40 % of all ties, cropped and welded the jointed rail, constructed electric catenaries, and installed an absolute block signal system.
38.
Many interurbans, including the other major Indiana interurbans and in particular Union Traction, suffered major wrecks as the result of few or no block signals.
39.
Scars block the ability of cells to divide and block signals from the epidermis, a layer of skin, that appear necessary to begin regeneration, she said.
40.
Very often but not mandatory the turnouts and block signals at an " " are remotely controlled or set from a central signal box.
