Before DPU came through, CN intorduced this fun boxcar. CP uses ex-BN 40's for the same purpose in Northern Ontario with SOO #'s. Generally these are put on the trail-end of a long train, at least 9000ft me thinks.
2:05pm CN 311, 149 cars
CN 5788-5425
2 autoracks, 58 boxcars (45 cut), 2 flats, 1 center-beam, cut of 8 US gondolas loaded with pipe, 20 hoppers (7 cut), 58 tankers (7+8+10 cuts)
Not sure why they needed an office door - There's a huge door in the center of the car!