At lunch I found a gold mine of old pictures of the Millstone branch on-line, from one of the local history/picture books of the Franklin Township area. Many 100+ years old.
http://books.google.com/books?id=uTrobt ... er&f=false. It is a Google Book preview - you don't get all the pages (and I'm not sure if you will see the same ones I see, or if you get the same pages each time you click), but page 46 shows a picture of the rubber plant in Millstone, which it says didn't close til 1983. Pages 34 - 68 are the RR and industry-related pics, although I can't see past page 50. I guess rail service ended in 1972(?) from what I have seen posted here on Millstone related threads here the past few years. Also, it burned down in 1912 but was rebuilt on site.
From elsewhere on the web
http://answers.google.com/answers/threa ... 17179.html, before it was a rubber plant (1910), it was the Olcott Distillery , starting in the 1850's,until 1880, when Fleischmann Distillery Company bought it. I saw conflicting links on whether it was a whiskey (largest in the US?) or a yeast distillery. One said that Fleischmann's invested $600K, and shipped live yeast in refrigerated RR cars.
Have fun, JS