SW-1

[ndbprr]

Any source that lists how many are still in service?  Thanks

[chefjavier]

Did you check motive power book by trains?

[nanaimo73]

They may be an up to date list somewhere, but I think it is unlikely.

You could check out these photographs and look at the dates-
http://www.rrpicturearchives.net/locoList.aspx?mid=68

[chefjavier]

Good information!