To copy the prototype in a photograph provided to me by Frenchy, I've ordered a 1:72 CCKW to join my 1:72 M6 as loads on an S-scale (1:64th scale) Rock Island flatcar.

When I shared this with members of my Model RR club one of the older members told me that, the ARR had operated a CCKW crane that had flanged rail-wheels bolted onto the hubs.

While I can't locate a picture of this specific prototype, I have found pictures of CCKW's with rail wheels and CCKW cranes, so it stands to reason that the ARR could have put these rail wheels on a CCKW crane.

I also discovered that HR Models has a CCKW 353 with rail wheels, but it is a standard CCKW, not a crane.

http://www.czechkits.com/172-gmc352-railroad-p-14609.html

Based on the design of the kit, it does not appear as though it would be difficult to mount a crane on this CCKW frame if one is available. However, I have not been able to locate an appropriate 1:72 crane, either as part of another CCKW kit, or elsewhere.

Would any of you know where I could find a CCKW crane model or other 1:72 crane model that would be appropriate???

The "closest" match I can think of would be the Coles Mk7 crane on a Thorneycroft Amazon chassis included in the old Airfix 1/76th scale set :



H.P.

Woodland Scenics makes a nice 1/87 caterpillar shovel which closely matches the crane cab in your photo. You could possibly combine it with the Airfix crane boom Frenchy posted, and have something really close to what you want. The 1/87 crane is in white metal, and is slightly over-scale to my eyes, so it would probably work out well, however, because it's white metal, it will be heavier than a 1/72 resin or plastic CCKW, so you may need to put some weight in the front end. Short of that, you might look at some model railroad equipment in 1/87 and see if that works.
VR, Russ