Where did you find the O gauge tinplate Porter? I've always wanted one of those! 
It's a K-Line product; they come up on eBay pretty regularly. Search for K-Line Porter and it will come up. The Raritan Copper Works road name is not common, but the prototype was 30" gauge, if I recall.
Not shown:
Lionel J&L Steel 0-6-0T switcher "Z"
Lionel 0-4-0T Dockside switcher 8209
(And a SP Daylight set, just because.)