Related under the skin.

[Peirce]

The blue loco is an Alco RS3m, the other is an EMD FL9. So, how are they related. In 1979, Conrail repowered the RS3 with an EMD prime mover. They also replaced the cooling fan with its rectangular housing and screen with two of the EMD, round, fan units.
http://www.railimages.com/albums/peircebehrendt/acg.jpg

This picture was taken of February 4th, at the Danbury Railway Museum, where both these units now reside.

[BoxcabE50]

By chance do you have a photo that would show the RS3m roof modifications? Am wondering what they look like...

:D

Boxcab E50

[Stourbridge Lion]

Here is D&H RS-3 #4112 before

http://www.trainweb.org/dhvm/images/dhrr_diesel/ALCO_RS-3/Gerry-Landau/4112-01.jpg
(Collection of Clint Chamberlin / Photo by Gerry Landau, September 28, 1971, Colonie, NY - Posted from DHVM Web Site)

and as RS-3u #503 after (same engine, new road number)

http://www.trainweb.org/dhvm/images/dhrr_diesel/ALCO_RS-3u/UNKNOWN/503-1.jpg
(Collection of Bill Weibel - Posted from DHVM Web Site)

[Peirce]

Here's the shot of the cooling fans atop the DRM's RS3m.
http://images1.fotki.com/v3/photos/4/41513/84259/rs3m9-vi.jpg

[BoxcabE50]

Peirce- Looks like a pair of fans straight off an old GP7.

Darren- What is the box behind the cab of the chop nose? Must be an air filter upgrade?

:D

Boxcab E50

[Peirce]

Peirce- Looks like a pair of fans straight off an old GP7.
They very well could be. I don't know where Conrail got the parts for the 1979 repower project. I guess, over the years, many RS3s were repowered.

[rush2ny]

Darren,
Which shop provided the RS-3u modification? Looks a bit like it's cousin, the RSD-15 "Alligator".

Russ

[Stourbridge Lion]

Darren- What is the box behind the cab of the chop nose? Must be an air filter upgrade?No clue... :(

Which shop provided the RS-3u modification?According tto the information I have these were rebuilt around 1975/6 by Morrison-Knudsen (Boise Shop)