Sep 27, 2008 · In the mid-20th century, trackless trolleys were built by the thousands, from General Motors’ single (hybrid) coach production (had the tires - didn’t rely on diesel fuel See United States v National City Lines,Perfect- 1949), to thePerfectst builder of trackless trolleys - Pullman-Standard, with 1,863 vehicles built between 1932 and 1951.