Ebay keeps a record of completed auctions for some period of time.
Currently for example, you can search the archive of 185,000+ railroad
photographs for whatever your heart desires. Sometimes you might get
lucky!

http://www.ebay.com/sch/Photographs-/74724/i.html?LH_Complete=1

Gary Roe asked about Jerseyville & Eastern and I sent him two scans
I had previously snagged from Ebay auctions in August and October of
2013... I could no longer find those, so Ebay obviously doesn't keep
permanently accessible auction records. Get 'em while they're hot!

Anyway I've found Ebay to be a wonderful source for railroad photos,
since many of the sellers now post high resolution scans -- most of
them are "watermarked" but for the price, I'm not complaining.

Tim O'Connor