Re: Telltale construction

"Rick Jones" <r.t.jones@[EMAIL PROTECTED]
> wrote

>    Another question, which I have not seen mentioned in any of the
replies 
> yet: How far ahead of a low clearance object would a telltale be placed?

It varied. I've got pix that show a telltale in Tehachapi distanced 
aproximately 120' feet from the relevant tunnel ****tal, but one of the two

in our town lay diagonally all the way across a four-laned center-divided 
highway from the bridge it protected; a distance of closer to 100 yards.
Had 
they spaced it the same as the one in Tehachapi, it would have stood right

in the middle of Hwy 99!

Since the purpose of the telltales was to give workers on the cartops 
warning of an upcoming obstruction, I suppose you could space them by 
counting the time it takes one of your faster trains to cover the distance

to the obstruction. Ten seconds seems like it would likely be enough time
to 
turn around, see the upcoming low clearance, and then duck...

-Pete