(Links provided by Robert Kelley.)
Other roundhouse/turntable WEB sites
http://www.nrhs.com/historic_structures/roundhouses/rh_data.htm http://www.northeast.railfan.net/roundhouse.html http://www.northeast.railfan.net/roundhouse1.html

Some Santa Fe Roundhouses
http://atsf.railfan.net/structures/round.html

A Great Northern WEBsite http://www.greatnorthernempire.net/index2.htm?GNESiteMap.htm

The National Railway Historical Society (NRHS)
http://www.nrhs.com/

(Links provided by Jim Stapleton.)
The Stapleton's 2006 Steam up as portrayed by the participants
http://www.mylargescale.com/forum/topic.asp?TOPIC_ID=41376

Railroad accessories
http://www.jelsma.com/

AL Z's Train Pages
http://users.adelphia.net/~studiozphoto/

(Links provided by Lawrence LaBranche.)
TIMBER HERITAGE ASSOCIATION http://www.timberheritage.org/

(Links provided by Fred Swain.)
Great Magazine(s) and WEB site
http://www.trains.com/

(Other links of interest provided by Bob Clark.)
Surviving steam in Northern America http://www.steamlocomotive.com/lists/USA.shtml

Surviving Northern types
http://www.steamlocomotive.com/northern/

Surviving private passenger cars
http://trainweb.org/passengercars/Indices/PV.htm