Either you have a typo in your locations list of mileposts or you have it placed in the wrong location in your list. The unk. location you noted as "332.2 A Station marked by two "STATION ONE MILE" signs" is also the same milepost location as Coxo. I suspect that you mean 322.2. I believe that this might be the location of the original Los Pinos siding before it was moved out into the meadow at it's current location.
Broads at 343.0 was also known as Broad's Spur. This was probably designated as a "Station" because they made lumber deliveries on that spur which was named after the proprietor of the lumber company (if I remember correctly).