Signal Basics. Signals: –Allow for safe operation of trains – protecting your train, other trains, and the equipment –Lets the railroad operate more efficiently.

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Presentation transcript:

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

Speeds Speeds are defined as: Track Speed Freight Trainsup to 59 MPH Passenger Trainsup to 79 MPH Medium Speed45 MPH Slow Speed30 MPH Restricting Speed15 MPH

What does this mean?

CLEAR Meaning: Proceed Allowed Speed: up to track speed

What does this mean?

APPROACH Proceed, approaching the next signal at slow speed (30 MPH).

What does this mean?

And, this?

STOP Meaning: Stop Dwarf

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:

Consider this common situation: An entrance to a siding track Where would you place signals to protect this track arrangement?

SIDING TRACK SIGNALS 1 st step: where should signals go physically?

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...

SIDING TRACK SIGNALS Finally: GTW practice requires that the signal leaving a siding be a dwarf (to avoid confusion with the mainline signal); and The 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!

So, what does this mean?

CLEAR Meaning: Proceed

And, this?

APPROACH Proceed, approaching the next signal at slow speed (30 MPH).

Here’s something new:

RESTRICTING Proceed, at restricted speed (15 MPH), prepared to stop.

OK, now let’s look at the exit from the siding:

Mainline: CLEAR Siding: STOP The train crew needs to know which track they are on! Dwarf

Another aspect:

Mainline: STOP Siding: SLOW CLEAR Dwarf What does Slow Clear mean ?!?

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

And, related to Slow Clear is this signal:

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!

But, what if you see this?

RESTRICTING Proceed, at restricted speed (15 MPH), prepared to stop. Dwarf Not Flashing!

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