Here is a picture of the Argentina:
If someone is interested, suggested further reading: Martyn Bane's detailed discussion of the Argentina; a more condensed article in Railway Preservation News; Trainweb article on Porta.
Also, here is an image of a SAR Class 26 "Red Devil":
*Lunatic*, n. One whose delusions are out of fashion.
I just felt that LDP should be noted along with the others in your series.
Great photo of the Red Devil keep to the Fen Causeway