Take a close look of my post. I am refering to the older EMD's such as the SD40 series, GP 40's, GP 38's, SD 50's, SD60's which and I'm sure you'll correct me if I am wrong and I'll appologize now if I am incorrect, These locos utilize the'60/70s tech. 645, albet. modified through the 80's. The 710 and newer 4 cycle engines are more powerful, efficient, and cleaner. EMD's own report, from which I drew my conculsion states the H-Engine (4-cycle) will mount in current EMD production models. Which tells me they are offering the H-engine as an option and possible future replacement. Remember the tier II standards are not the final point but another step to further restrictive emission controls and EMD is preparing. Now as far as 2 cycle vs 4 cycle. The 2 cycle has a combined ignition/exhaust cycle which causes a fair amount of unburned raw fuel to be exhausted, hence higher emissions, where as the 4 cycles have separate ignition and exhaust cycles where more fuel is consumed during the ignition phase before the exhaust valves open, allowing less raw fuel to escape. Basic engineering, ask any mechanic or engineer (the kind with the computer, not in the loco cab.)
Now if I remember one of the early questions on this tract originally
asked why the GE -7's were swiftly disappearing and the older EMD's were still soldering on. I was trying to answer that persons inquiry and I stand by my original explantion. I did not intend to get into a lengthy discussion about wether EMD's 710's are any better or worse then the latest GE offerings, or that EMD's H-engine "is" replacing the 710. If that was interpreted I am sorry, I was simply relaying info. which I have read and interpreted from Trade magazines, not "rumors I heard". This discussion belongs up in the builders forums.
I am sure it was a C-32-8, they had the very distictive rounded roof and large Dynamic fan box (hump)right behind the cabs. I thought the c-39-8 were built with the squared off cab foof lines. If I see it again, I'll try to get the cab number. I also saw -7 CSX axle in a consist at frountier engine house. I only caught the 1st two engine numbers of 70**. was it a c-36-7?
Harleys and EMDs, some of my favorite rides