Links of interest

Railroad Glory Days (.com)
Railroad Glory Days (.net) WordPress page
RailroadGlory Days on Facebook
RailroadGlory Days on Google+
Baker County Chamber of Commerce and Visitors Bureau
CA&E Yahoo discussion group
Colorado Railroad Museum
Cumbres & Toltec Scenic Railroad
DuPage County Historical Museum, Wheaton, Illinois
Durango & Silverton Narrow Gauge Railroad
Electric City Trolley Museum, Scranton, Pennsylvania
Ffestiniog & Welsh Highland Railways
Fox Valley Trolley Museum
Georgetown Loop Railroad
Grand Canyon Railway Great Little Trains of Wales
Hobnob Tours of San Francisco
Illinois Railway Museum, Union Illinois
Illinois Prairie Path
Knott's Berry Farm Lang and Pugh
Lang, William biography
Lang, William Works of
Midwest Old Thrashers (Midwest Electric Railway), Mt. Pleasant, Iowa
Reader Railroad, Reader Arkansas
Rockhill Trolley Museum, Rockhill Furnace, Pennsylvania
Rio Grande Scenic Railroad
Royal Gorge Route Railroad
San Luis & Rio Grande Railroad
Seashore Trolley Museum, Kennebunkport, Maine
Sumpter Valley Railroad
Talyllyn Railway
Welshpool & Llanfair Light Railway
White Pass & Yukon Route Railroad
Villa Park Historical Society Museum, Villa Park, Illinois

Other sites of interest

Narrow Gauge Net, a free, downloadable magazine devoted to British narrow gauge.
A History of Trolleys, Light Rails, Street Cars and Subways
     (Thanks to Kerri Bass for the link.)