Western Railroad Discussion > So, what's "hoar frost"....my railroad answer.

All,

I mentioned to a friend today that last week I was up in the Front Range photographing trains (what few there were) with some hoar frost on the trees. The friend mentioned
that she didn't have a clue what hoar frost was and if I had an example of what I was mumbling about. So I came up with this image of the Ski Train from March 25, 1990,
shot looking down at Tunnel 3 in the Flatirons above Denver. I thought you folks might enjoy the slide.......

Motive power was D&RGW SD40T-2s 5349 and 5375.

Comments, thoughts?

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Yah, Seattle when it drops below freezing at night, the trees are full of it.

Out

This not so good photo may illustrate hoar frost. The STBR south of Crescent Mills, CA 1-86.

TJY



Edited 1 time(s). Last edit at 12/10/18 18:06 by icancmp193.

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That's a spectacular photograph!

"Hoar frost" as it applies to the jet aircraft I fly for a living.....is a thin coat of frost, on the fuselage, that allows you to see the paint on the aircraft, even though there is frost on the aircraft.

johnl26  go get yourself  some rhyme icing  :o)

lovely shot,   IOTD for sure

thanks for getting up there and freezing for us

I enjoyed working for the ski train kinda



Edited 1 time(s). Last edit at 12/11/18 07:07 by dan.

We used to call it “pogo nip”.

Copy19 Wrote:
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> We used to call it “pogo nip”.

https://epod.usra.edu/blog/2018/01/beware-the-pogonip.html

For a railroad-related context, under the right conditions the CN/VIA turbos would create a trailing ice fog (similar to the contrails produced by high-altitude aircraft).

Ray 

Ray_Murphy Wrote:
-------------------------------------------------------
> Copy19 Wrote:
> --------------------------------------------------
> -----
> > We used to call it “pogo nip”.
>
> https://epod.usra.edu/blog/2018/01/beware-the-pogo
> nip.html
>
> For a railroad-related context, under the right
> conditions the CN/VIA turbos would create a
> trailing ice fog (similar to the contrails
> produced by high-altitude aircraft).
>
> Ray 

It's quite possible to coat a locomotive with hoar frost when it's above freezing when it is going fast enough in very humid conditions that condense onto the metal and then supercooling effect causes it to freeze. Can't say how many times I have stepped out the cab expecting cool but balmy conditions and ended up not finding any traction for my feet!

Great shot. I am grateful for the timing of your post. I just had your book "Rio Grande A Last Look Back 1974-2010" out over the weekend discussing with an acquaintance some profile characteristics on the Tennessee Pass line (Page 112). This conversation had grown out of a where we had eaten in Leadville (Wild Bill's) prior to a skijoring event a couple of years ago. Anyway, the bottom line of our conversation was, the less UP does with this Railroad, the more appreciative I am of your book. Thanks again for your post.

All,

I guess you folks liked the shot. Thanks ever so much for all the positive comments and shared knowledge about
"hoar frost", I mean, "pogonip" in Nevada!!

Again, Thanks!!

Rich