This was posted by UrbanCincy last year.
The first graphic is from almost 100 years ago. The second graphic represents the modern day update, from UrbanCincy:
Ford Taurus dimensions were used for average auto size with an average of 1.2 passengers. Skoda ST10 dimensions were used for average streetcar size with an average of 85 passengers. What was seen is an increase in both the average space taken up by streetcar passengers and auto passengers. Auto space saw a 142% increase which dwarfed the 26% increase for streetcar passengers.