And, I don't think there's all that much of W Texas that has dual mainline, anyway, really. I couldn't find a UP route map with sufficient detail in a quick search to confirm, but I've driven the stretch north of Amarillo where there's a goodly-size coal-fired plant burning Powder Basin coal and seen them on sidings there...and there's certainly no double line when get on up across E Colorado. I also travel US 287 from Lamar thru Eads to Limon as it cuts off the 90 corner for us to get to Denver and there's a couple-mile siding along there. It doesn't show on UP route map that I saw but I don't think those maps were any but main routes; not every mile of track. Or, it could be that is an interconnection local line across there; I've not investigated. There's another coal-fired plant W of Garden City, KS, that gets service via an interconnect to the Santa Fe that comes from up across that way as well to/from Powder Basin and/or Wyoming...