Pictures of BNSF 3916 have been posted online.
Not sure if this is the first production Tier IV GE, but it is among the first. Note that the model is listed on the frame as 'ET44C4' and that the hump around the exhaust stack has been shortened to the area immediatly adjacent to the stack.
http://www.rrpicturearchives.net/Locopicture.aspx?id=208714
The radiators are clearly in two sections, the rear presumably the normal radiator and the forward one probably for the intercooler replacing the air to air intercooler on the ES series. The "hump" might cover some equipment for air to water intercooling or the exhaust gas recirculation.
M636C
In my previous post I mentioned the "hump" at the rear of the engine compartment in the ET44C4 illustrated in the links above.
GE haven't provided much detail of the revised GEVO engine fitted to the ET44 locomotives, but fortunately have published a photograph of "GE Marine's non-SCR Diesel" as part of a download at:
http://media.getransportation.com/sites/default/files/L250V250%20EPAT4i%20IMOTIII%20Engine%20Factsheet_0.pdf
On the cover, this shows the turbocharger mounted higher than in the previous GEVO design and feeding what I take to be an exhaust gas cooler on the right side of the engine which appears to feed into a duct linking it to a watercooled intercooler on the left side of the engine.
Clearly the exhaust stack would be just above the turbocharger, so this should explain the "hump" just forward of the radiator on the ET44.
I have seen reports that both BNSF and CN have taken delivery of ET44s recently. (In both cases, the delivery was two units, but the road numbers were not consecutive.)
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