By the way to clarify the "Mudd" above, names over the doors for the most part does not connote a lessee, but is actually the name given to the car.  There are a few exceptions to this, including a car LPTC 683 named "Goyert & Vogel", an image of which can be seen in Kristin's excellent presentation.  Her presentation also shows an image of Mudd as LPTX 666 as well as enough images to suggest there was considerable variation in even the PPKX & LPTC car paint schemes.