What is a signal indication?
Signals have aspects and indications. The aspect is the visual appearance of the signal; the indication is the meaning. In American practice the indications have conventional names, so that for instance “Medium Approach” means “Proceed at not exceeding medium speed; be prepared to stop at next signal”.
What is Union Pacific known for?
The combined Union Pacific–Central Pacific line became known as the First Transcontinental Railroad and later the Overland Route. The two lines were joined at Promontory Summit, Utah, 53 miles (85 km) west of Ogden on May 10, 1869, hence creating the first transcontinental railroad in North America.
What signal represents a danger aspect?
A yellow aspect (Caution) tells the driver that the next signal is red (danger) and that they must slow down in preparation to stop at the next signal. The next aspect will always be red (danger) unless it changes as more the train’s route is clear.
What is the normal aspect of automatic signal?
(2) The normal aspect of an Automatic Stop signal is “Proceed” Where however, the signal ahead is manually operated, the aspect normally displayed may be “Caution” or “Attention”.
What signal represents a proceed aspect?
green aspect
The green aspect and the four yellow aspects are known as ‘proceed aspects’, as they allow the train to pass the signal; the red aspect requires the train to stop. Two-aspect systems use red and green only. Three-aspect systems include yellow.
What was the importance of the Union Pacific Railroad?
With its acquisition of the Southern Pacific Rail Corporation in 1996, Union Pacific became the largest domestic railroad in the United States, controlling almost all of the rail-based shipping in the western two-thirds of the country.
What is 2 aspect signalling?
Two-aspect signalling involves two types of signals, i.e. stop signals and repeater signals. A stop signal shows a red light for “danger – stop” or a green light for “clear – proceed”. Where sighting is good, drivers are expected to be able to stop at a ‘danger’ signal with no advance warning.
How many types of signals are there in railway?
3.09. (1) The Stop signals which control the movement of trains approaching a station are of three kinds, namely-Outer, Home and Routing signals.
What do railroad signal lights mean?
Red means stop; green means proceed, and yellow means caution or approach, usually indicating that the next signal is red. For other aspects, the general principle is that green on top means main route or normal speed, and red over green or yellow indicates diverging route or medium speed.
What is signal aspect?
3.01. General use of signals. – 3.01 (i) (a) “Aspect of a signal” means the appearance (position of arm or colour of light) of a fixed signal as seen by the Loco Pilot of a train approaching it from the direction (Up or Down) to which it refers.