The Pennsy did the same with owned but independent subsidiaries until merged into the parent corporation. For a long time the equipment owned by companies "west of Pittsburgh" was lettered "Pennsylvania Lines" . The companies such as PFT&C (Fort Wayne) and PCC&STL (PanHandle) were the two biggies, but there were many others. Until after WW I sometime in the early 1920s, PRR Lines West maintained separate engineering and building shops in Fort Wayne. The PRR N1 2-10-2 for example was Lines West design to do the same work as the PRR I1 2-10-0. The PRR H10 was a LInes West Design while the H9 was PRR.
By the 30s and onward the power moved around a lot.