West Coast Air Transport  Bach 3-CT-4 Air Yacht    (Registration and c/n unknown)

                                  

                                       I gleaned this image when I worked for Western Airlines in 1958.   The tri-motor Bachs were
                                       somewhat of an oddity in that the main fuselage engine was a Wright J5 and the smaller wing
                                       nacelle power pods were Ryan-Siemens 9s.  Morton Bach originally had an aircraft maintenance
                                       shop on the old Clover Field in Santa Monica, before building his own designs.  Several airlines
                                       flew Bachs although WCAT were the first to do so, back in 1928.  The airline operated no less
                                       than eight of these tri-motor aircraft on a service from Seattle to Portland (its base) and San
                                       Francisco, beginning in March 1928.  A year later it was acquired by Union Air Lines of
                                       Sacramento.  Shortly after that (late 1929) Western Air Express bought the line.  . I believe
                                       there were about 30 Bachs (of all models) built.