signal basics
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Signal Basics. Signal Basics. Signals: Allow for safe operation of trains – protecting your train, other trains, and the equipment Lets the railroad operate more efficiently Provides the train crews with information on speed and route - PowerPoint PPT PresentationTRANSCRIPT
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Signal Basics
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Signal Basics
• Signals:– Allow for safe operation of trains – protecting
your train, other trains, and the equipment
– Lets the railroad operate more efficiently
– Provides the train crews with information on speed and route
– Reduces paperwork and radio traffic between train crews and dispatcher
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Speeds
Speeds are defined as:
Track Speed Freight Trains up to 59 MPHPassenger Trains up to 79 MPH
Medium Speed 45 MPH
Slow Speed 30 MPH
Restricting Speed 15 MPH
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What does this mean?
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CLEAR
Meaning: ProceedAllowed Speed: up to track speed
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What does this mean?
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APPROACH
Proceed, approaching the next signal at slow speed (30 MPH).
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What does this mean?
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And, this?
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STOP
Meaning: Stop
Dwarf
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Simple, right?
• But in railroading, there are situations where the simple Green / Yellow / Red indications are not enough.
• That is why more signal aspects were created:
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Consider this common situation:
An entrance to a siding track
Where would you place signals to protect this track arrangement?
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SIDING TRACK SIGNALS
1st step: where should signals go physically?
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SIDING TRACK SIGNALS
Next: if we change this signal, we can give more information to the train crew . . .
The second light (or arm) can tell the crew about the route they are taking, or the speed they need to be running at . . .
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SIDING TRACK SIGNALSFinally: GTW practice requires that the signal leaving a siding be a dwarf (to avoid confusion with the mainline signal); andThe home signal on the left has to have a lower fixed red signal (to make it an absolute signal)
Dwarf
There! We now have our new signals for this interlocking!
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So, what does this mean?
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CLEAR
Meaning: Proceed
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And, this?
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APPROACH
Proceed, approaching the next signal at slow speed (30 MPH).
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Here’s something new:
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RESTRICTING
Proceed, at restricted speed (15 MPH), prepared to stop.
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OK, now let’s look at the exit from the siding:
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Mainline: CLEARSiding: STOP
The train crew needs to know which track they are on!
Dwarf
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Another aspect:
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Mainline: STOPSiding: SLOW CLEAR
Dwarf
What does Slow Clear mean ?!?
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SLOW CLEAR
Proceed, at slow speed (30 MPH) within interlocking limits or through turnouts. Do not exceed 30 MPH until clear of
interlocking or turnouts.
Dwarf
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And, related to Slow Clear is this signal:
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SLOW APPROACH
Proceed at slow speed (30 MPH) within interlocking limits or through turnouts, prepared to stop at next signal. Do not
exceed 30 MPH.
Dwarf Look! I’m Flashing!
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But, what if you see this?
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RESTRICTING
Proceed, at restricted speed (15 MPH), prepared to stop.
Dwarf Not Flashing!
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This has been a presentation of:
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