Well here is all of the information I found... There are a couple of pictures of this type of carrier
here, a few rows up from the bottom...
I found some information on Wikipedia, but it seems to contradict itself, at least it does the way I am reading it... Apparently in 1957 CN built 75' auto carriers (the ones I am talking about are a model of a 75' carrier) with end doors... Now Amtrak's Auto Train purchased some of these carriers from CN sometime before 1976... In the last paragraph below though, it says that US carriers did not get siding until the 1970's and then roofing and doors in the 1980's... So is my picture of one of the CN style carriers that CSX purchased :dunno:
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From:
http://en.wikipedia.org/wiki/Auto_Train_(Amtrak)
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From:
http://en.wikipedia.org/wiki/Autorack