My characters need to get around the big city of Chicago (with 1.7 million people in 1924, when my story takes place) with public transportation. Public services differed from city to city, and I learned that in Chicago, what were called trolleys in some cities (connecting to overhead electric wires) were called streetcars in Chicago. These pictures date from the late 1920s.
Another good detail I can use is that stops were marked by a black pole with a white band, as seen below,in the lower left corner.
And sometimes, double cars ran on Chicago’s busiest routes:
All good details to make my story feel genuine.
If you’re interested in the subject, click here.