I have not seen photos of 16 and 18 in Peru. There is a color photo of former 50 in Peru that I have seen, but I don't have it on this computer. It may be on the hard drive of a computer we are not currently using. I have been meaning to find out as this came up a month or 2 back.
I recall visiting SVRR probably the summer of 78 or 79 and 19 and 20 were as shown in the photo Steve posted except they still had the much rusted out boiler jackets on and lagging hanging out here and there. I wish I had taken photos as I remember climbing up in the cab and giving them a good look over. I never dreamed I would see one of them running, or get to fire and run one at some future point. Hope I find time in my life to get involved and do it again in the next few years.
There are color photos of 80 and 81 as they sat in the dead line at Skagway probably taken not to long before they came south. If you do a search for some of the WP&Y fan sites you can find them.