When the Alaska Railroad started interchange service via barge to the lower 48 they built several HyCube cars in the 1000 series.  Number 1019 is now at the Museum of
Alaska Transportation and industry.  These cars started as two Troop Sleeper Box Cars.  With the roof removed from one car, a roof section of the second car including everything from the top of the windows up was spliced on by the local welder.  Roof walks and ladders were removed down to 4 rungs and brake wheel lowered as part of the project.   Doors were welded up from the best remains of the old doors.  Both 6' and 7' doors were used.   Old time railroaders claimed,  "Those things were only good for Ping-Pong balls and kotex, and we always feared they would blow over in Bear Valley enroute to Whittier, and they sometimes did.