The interurbans were the fast ones: electric railways that ran between towns
at speeds the steam railroads matched only on their main lines, and that stopped
in the middle of every village on the way. George Hilton and John Due, whose 1960
account remains the standard reference, put the network at 15,580 route-miles
at its 1916 peak (Hilton & Due, via Wikipedia).
By 1940, the Dictionary of American History
records, at most 4,000 miles remained — a quarter of the peak. Hilton
and Due’s own count, as summarised by American-Rails,
has 1,519 miles by 1950 and 209 by 1959.
The streetcars were bigger still. Working from the McGraw street-railway
directories, Li, Lahoorpoor and Levinson find that US street railway track reached
an observed maximum of 50,120 miles in 1918, and that 152 metropolitan
areas had systems of at least a hundred miles each
(Findings, 2026).
By the 1960s, the first-generation streetcar survived in seven US cities:
Boston, Cleveland, New Orleans, Newark, Philadelphia, Pittsburgh and San Francisco
(Wikipedia, “Streetcars in North America”).
Everywhere else, the tracks were paved over and a bus was put on the route, and
within a decade most of those bus routes carried a fraction of what the cars had.
The last car, by city, 1940–1966: the year each city’s
principal electric streetcar operator ran its final service, from the dated entries in
Wikipedia’s list of US streetcar systems.
Twenty-seven of the fifty-four metros in the game are on this rail; the game’s
earliest decade, 1920, is the last one in which all of them still ran.