"Mass Transit" (1930)

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I'm looking into "mass transit." The first 1930 cite below is in a few editorials. Where does it come from?..Gotta go to sleep.
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(OED)
mass transit chiefly N. Amer., an extensive, coordinated system of public transport, esp. in an urban area.
1956 Polit. Sci. Q. 71 89 There has been virtually no work on the economic problems of integrating private and public automobiles with *mass transit in an optimum passenger transportation system for a metropolitan area. 1972 Village Voice (N.Y.) 1 June 10/2 They piously explain how electricity is needed to save the environment through sewage treatment plants and mass transit. 1992 Enroute (Air Canada) Aug. 50/2 The streetcars rumbling past are probably the only reminder that this is a place big enough to warrant mass transit.
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28 February 1930, <i>Chronicle-Telegram</i> (Elyria, Ohio), pg. 24, col. 1:
Some communities have come within reasonable distance of a solution of their mass-transit difficulties.
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21 October 1934, New York <i>Times</i>, "First New York Subway Is Thirty Years Old," pg. 27:
But the idea holds that long-haul "mass transit" must be accomplished by trains more or less like our present electric rapid trains, conveniently provided with underground trackways.
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9 July 1936, New York <i>Times</i>, Letters, pg. 20:
The real attack on the problem was made, and the real solution obtained by the American Transit Association, which decided that mass transit for large cities should be by trolley, and then went ahead with a research program, more comprehensive than any previous study.