FMC 5503 52' Double-Door Boxcar Master St. Maries River Railroad 52053Details: Box cars in the past fifty years have generally fallen into one of five distinct frame lengths, 40 , 50 , 52 , 60 , and 86 foot. The least common of these is the 52 foot box cars. Although not as numerous as its shorter and longer companions, the 52 foot non insulated box designs have provided an important role in the lumber industry. The car is essentially a stretched 5277 with one foot added outside the bolsters giving the car its