Shameless self-promotion: I've passed a landmark with my Fotopic site -
now over 2,000 railway photos on line. You're welcome to look around.
here are shortcuts to thumbnail index pages:

http://gallery120232.fotopic.net/c358868.html - GB diesel locos
http://gallery120232.fotopic.net/c360523.html - GB DMUs
http://gallery120232.fotopic.net/c360422.html - GB electric locos
http://gallery120232.fotopic.net/c363683.html - GB EMUs
http://gallery120232.fotopic.net/c365193.html - GB Departmentals
http://gallery120232.fotopic.net/c402455.html - GB light rail/trams
http://gallery120232.fotopic.net/c398531.html - GB Steam (main line)
http://gallery120232.fotopic.net/c398540.html - GB Steam (other)
http://gallery120232.fotopic.net/c368644.html - GB Miscellany
http://gallery120232.fotopic.net/c426527.html - German Locos (DB)
http://gallery120232.fotopic.net/c366837.html - French locos (SNCF)
http://gallery120232.fotopic.net/c371942.html - Swiss trains (SBB)
http://gallery120232.fotopic.net/c371905.html - Swiss trains (non-SBB)
http://gallery120232.fotopic.net/c359241.html - Austrian trains (OBB)