Control points, controlled signals and intermediate signals

[NW Mailing List]

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


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://six.pairlist.net/pipermail/nw-mailing-list/attachments/20130821/21b1bb69/attachment.html>