Control points, controlled signals and intermediate signals

NW Mailing List nw-mailing-list at nwhs.org
Wed Aug 21 11:45:41 EDT 2013


A signal shows only colors, you have rulebooks etc designating what
where is the speed limit.
Limits may be track posted.

as always..you have to "know your railroad"

-Lynn-
On 8/21/2013 9:22 AM, nw-mailing-list-request at nwhs.org wrote:

> Subject:

> Re: Control points, controlled signals and intermediate signals

> From:

> NW Mailing List <nw-mailing-list at nwhs.org>

> Date:

> 8/20/2013 11:40 PM

>

> To:

> NW Mailing List <nw-mailing-list at nwhs.org>

>

>

> On 8/20/2013 2:20 PM, NW Mailing List wrote:

>> For the engineer, the signal indicates the speed to

>> operate...really...period.

> Lynn,

> You have to be careful how you qualify your

> statements...really...period!

>

> For example the definition of a "Clear" signal is: Proceed at

> prescribed speed.

> So, what is the "prescribed speed"?

> It could be 10 mph or 15 mph or 25 mph, etc., etc. It depends on

> where you are.

> Where do you find what is the prescribed speed?

> From the Employee Timetable. Maximum authorized speed for portions

> of track are posted in the ETT. A District may have more than one long

> sections of track where the maximum authorized speeds are different.

> Then, you have curves where the speed is restricted to something

> lower than the maximum. These restricted curves are also listed in the

> ETT.

>

> Now, throw in the definition of "Restricted Speed" which is: A speed

> that will permit stopping short of train, engine, obstruction, or

> switch not properly lined and looking out for a broken rail, but not

> exceeding 15 mph.

> There is a lot of leeway in there. Maybe conditions allow you to

> see far enough ahead that it is safe to run 15 mph. Or it could be so

> foggy that you have to put the brakeman/conductor on the ground and

> walk ahead of the train, in which case you are at the most crawling

> along.

>

> So, speed isn't necessarily...speed...really...

>

> Jimmy Lisle


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