I was driving though Altoona recently and went to take a look at the shops. SD40s 3170 and 1580 are both still there. My research on these two units shows that they are the first SD40s for both Southern and Norfolk and Western. Seeing this, I'm assuming NS has put both out of the scrap lines to Cresson in order to preserve the two. Does anyone know what museum or museums these two are to be going to?