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[quote user="M636C"]Having checked Wikipedia, the SC-44 is indeed said to have a "roof height" of 12'6" but the locomotive is 14'4" high over the "Roof Shroud".[/quote] I think the shroud is a kind of spoiler at the end of the SC44 on Caltrans unit: <a href="https://farm5.static.flickr.com/4512/23909956368_0867c0b1bc_b.jpg">https://farm5.static.flickr.com/4512/23909956368_0867c0b1bc_b.jpg</a> Here is a link to a Siemens presentation about their North American passenger locomotives held on railway vehicle conference in Graz Austria in April 2016. <a href="http://www.schienenfahrzeugtagung.at/download/PDF2016/MoN01_Schieber.pdf">www.schienenfahrzeugtagung.at/download/PDF2016/MoN01_Schieber.pdf</a> The Charger starts on page 18. It contains interesting renderings showing how cramped the locomotive is. [quote user="M636C"]There are a lot of four axle locomotives with 16 cylinder 710 engines, including the Wabtech MP series. I'm sure that these could be upgraded with a railroad version of the E23B SCR equipment, particularly in California where such things are taken seriously.[/quote] The MPI MP40PH-3C, the only one with a EMD 710 engine, already weighs 289,000 lbs according to Wabtec specifications. Put additional 8,000 lbs on the frame and axle load get to <s>74,25 </s>37.125 tons. Is this acceptable? The other locomotives in the MP XPress series have EMD 645 engines. With a 710 engine there are the F59PH and F59PHI, the DM30AC (282,000 lbs), and the Alstom PL42AC (287,000 lbs). The weights are without SCR. I think weight might be the stopper. Regards, Volker Edit: On Metra the MPI MP36PH-3C are banned from some routes because of weight issues. The F59PHs might be better canditates. I think there is a different issue. If I understood correctly rebuild locomotive have to comply with the current FRA crashworthiness standards since 2009. Edit 2: I corrected the underlined number
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