I believe that a good locomotive to bring to TS 2020 would be the GE ET44AC. I know that a third-party developer called eyein12 has already made it, but it would be great if he could get it officially licensed for TS or it could be created seperately (although his is extremely good). The ET44 is a Tier 4 diesel, meaning that it meets the EPA's emission restrictions. Every Class 1 railroad in the US (KCS, BNSF, UP, NS, CSX, CN, and CP) has some on their roster except Canadian Pacific. This means that if was offered in the schemes of all or most of the railroads that own ET44's, they could be used on almost all North American routes realistically. I am personally a BNSF and KCS fan, but would love to see any of these. Whether its a NS ET44 hauling a coal train down from Bailey Mine on the Coal District, or a CSX one flying along the Miami to West Palm Beach route, or a UP one making the grade on Sherman Hill, I would love to see this engine. God Bless.