[CompClassics]

"Not for LA. They were pushed out in a hurry so got their own number set. 6000 cars occurred much later and 4000 cars were still being assigned."

So what is the series number for the "LA" cars then, if not CSX4XXXLA?? I would expect anywhere from CSX4000LA to CSX4999LA if SAI had achieved that production figure. Again the "LA" and "SA" suffixes were being used so they could differentiate those cars from the Las Vegas built cars while still retaining the basic model series number which started with CSX4......

The reason for the "LA" and "SA" manufacturing was because SAI was having trouble supplying cars to people that had placed orders/ deposits and needed to outsource manufacturing to fill orders ASAP.