Ad
related to: used semaphore signals for sale
Search results
Results from the WOW.Com Content Network
Semaphore signals were patented in the early 1840s by Joseph James Stevens, and soon became the most widely used form of mechanical signal. Designs have altered over the intervening years, and colour light signals have replaced semaphore signals in most countries, but in a few they remain in use.
A semaphore signal on the Atchison, Topeka and Santa Fe Railway in 1943. Semaphore signals were first developed in England in 1841. [2]: 169 Some U.S. railroads began to install them in the early 1860s, and semaphores gradually displaced other types of signals. The Union Switch & Signal company (US&S) introduced an electro-pneumatic design in ...
Semaphore (lit. ' apparatus for signalling '; from Ancient Greek σῆμα (sêma) 'mark, sign, token' and Greek -φόρος (-phóros) 'bearer, carrier') [1] is the use of an apparatus to create a visual signal transmitted over distance. [2] [3] A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms.
[6] Other manufacturers used were Siemens, AEI-GRS, GPT Plessey, GRS Syncrostep, and British Power Railway Signalling Co (B.P.R.S.) [7] Power-operated points were generally electrically driven with 110V ac Westinghouse Brake and Signal (WBS), M2, M3 and M5 style equipment. At Auckland, Dunedin and the Te Rapa marshalling yard were air operated ...
Timetable and train order was not used widely outside North America and has been phased out in favor of radio dispatching on many light-traffic lines and electronic signals on higher-traffic lines. The only railroads currently still using authentic train order operations is the South Shore line in Indiana and the LIRR in New York.
A position light signal is one where the position of the lights, rather than their colour, determines the meaning. The aspect consists solely of a pattern of illuminated lights, which are all of the same colour. In many countries, small position light signals are used as shunting signals, while the main signals are of colour light form.
Electric light signals and crossing lights are also operated from the signal frame. [1] A metal key, in the shape of a small metal rod, can be removed from a lock attached to the signal frame. This immobilises the signal frame levers, and the key can be used to unlock a smaller mechanical ground frame to the north-east of the station.
The shape of the trafficator arm is closely based upon the shape of the semaphore signal arm used by the Royal Bavarian State Railways beginning in 1890. The shape differs in that the trafficator has only the lower 'blade' of the rail signal's terminal 'arrowhead', so that the retracted trafficator sits flush with the vehicle's exterior.
Ad
related to: used semaphore signals for sale