
At that point, the CSL had but one motor coach line, the 76-Diversey, and operated over 3000 streetcars, so they decided to string wire and use trolleybuses. Trolleybuses were considered feeders for CSL streetcars, and later, CRT/CTA Rapid Transit (the L ), either as extensions, or connectors. 1930 saw seven lines established, with another five coming later on in the 1930s.
The first generation of Chicago trolleybuses started with an order for 74 from Twin Coach, Brill, St Louis Car, ACF, and Cincinnati Car in 1930. Another 40 were purchased in 1931 from Twin Coach, St Louis Car, and Cincinnati Car. Six from Pullman in 1935, 15 from St Louis Car in 1936, and 17 more from Brill in 1937 rounded out the first generation.
These coaches served until the mid-1950s. 84, 192 and 193 are preserved at the Illinois Railway Museum.
Source: The Trolley Coach in North America
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