A great map of Denver from 1904, showing the extant lines of the Denver City Tramway Company (DCTC) in green, with planned lines in red – rapid expansion seemed to be the name of the game!

The DCTC is unusual for a couple of reasons: it used the less common 3-foot-6-inch “colonial” narrow gauge for its lines instead of standard gauge, and referred to itself as a “tramway”, a term used almost nowhere else in the United States – streetcar or trolley normally being the terms of choice. No one seems quite sure exactly why this term was employed in Denver.

Source: Harvard Library Archives