This model project marked a sort of turning point in my diesel modelling. A visit to a local model shop found an Athearn SD40-2 and a GP50, both un-boxed, both without dynamic brakes and both very cheap! I couldn't resist. So here I was; modelling the C&O and PRR in the 'sixties with two models that didn't fit with my timescale or (as in the case of the GP50) even that my chosen roads had bought these models. What the heck, they were cheap!
I decided to use these models to further my modelling interests and develop a further knowledge of the prototype. For the SD40-2 I scoured the published photographs to see who had non-dynamic locomotives and discovered that there were an awful lot on Union Pacific - I had taken photographs of several having been converted to B units. I researched a little more and found out that these locos had started out as belonging to Missouri Pacific, originally in Mopac's dark blue livery. Then I found a couple of photos of the units in Union Pacific's colours of Yellow and Grey but lettered Missouri Pacific. Problem solved!
The actual model doesn't add much to the Athearn model. The rear grilles were my first use of the excellent Cannon detail products - still the best you can get, although other manufacturers are catching up. The major difference is something I rarely see mentioned about Mopac units. The air tank above the fuel tank is moved forward from the usual EMD supplied position to allow for the Mopac specification of double fuel fillers, fore and aft on the fuel tank. This can be seen above, even if the flash has 'bounced' badly on the body of the long hood. And, of course, I didn't notice the bent horn until I scanned the photos! A set of Microscale 'North Little Rock' Union Pacific / Missouri Pacific decals give the distinctive shape to the letters and numbers.