EMD M-16 power car. One of 68 built between 1954 and 1960, to sell to municipalities as backup generators, and had a 16-567C inside with an AC generator. This one is located north of San Antonio

https://www.facebook.com/photo/?fbid=10162658057417737&set=gm.25280226305012848&idorvanity=379577942171029

to see what one looked like when newish, https://www.facebook.com/photo.php?fbid=936169725734208&set=p.936169725734208&type=3