Figure 4.
1930s Boston streetcar. A two-car train of center-entrance streetcars on Tremont Street at Upton Street (just north of Dartmouth Street), probably in the 1930s. From City of Boston Archives, West Roxbury, USA, via Wikimedia Commons (https://www.commons.wikimedia.org/wiki/File:Streetcars_on_Tremont_Street_opposite_Upton_Street,_1930s.jpg).