John, both diesel the 111 and 112 are on daily use at the US Gypsum. I don't think that there is any of them on sale. Recently, the former US Gypsum GE 1203 and 1303 were moved from Georgetown Loop to Golden. Images can be seen at my web page, too. If the C&TSR needs diesel power, there is no on sale in North America.
I suggest to search in Central or South America. As fas as I have seen there are a few diesel engines at the former Standard Fruit Railroad. Their shop has interesting diesel engines. You only need to overhaul them and ship them to the lower 48's. If you know more on their activites please inform the group here.