Numbers Builder Built Model Notes 50- 79 Twin 1936 41-RTT 80-123 St. Louis 1937 124-163 Yellow 1938 1208 164-173 Twin 1939 41-GTT 174-228 Pullman 1940 40BS-102-41CX 229-273 St. Louis 1941 274-323 Pullman 1942 40CS-102-41CX 324-349 Marmon-Herrington 1947 TC-44 350-423 Pullman 1942 46BS-102-45CX 424-449 Marmon-Herrington 1948 TC-44 500-514 Marmon-Herrington 1946 TC-44 ex ITS 663-677 515-539 Marmon-Herrington 1947 TC-44 ex ITS 678-702 540-549 Marmon-Herrington 1948 TC-48 ex ITS 703-712 550-564 Marmon-Herrington 1948 TC-48 ex ITS 766-780 565-589 Marmon-Herrington 1952 TC-48 ex ITS 741-765Trolleybuses 500-589 were acquired from the Indianapolis Transit System in 1957. Numbers 500-514 were assigned, but those trolleybuses never operated in Milwaukee.
Milwaukee & Suburban Transport Co. trolleybus #441 was built by Marmon-Herrington in 1948, and is preserved at the Illinois Railway Museum.