Triple crown containers instead of roadrailer trailers.

[railroad65]

I remember seeing these containers on regular TOFC/COFC trains during the early 90's. They came and disappeared, seems like overnight. Why did they use these containers and what happened to them? Did they have trouble getting Mark V equiptment?

http://www.railpictures.net/viewphoto.php?id=95029


Just happened to find this picture, so far the only one I've seen, and it jogged my mind.

Railroad65

[UPTRAIN]

Now, were those in between the trailers with the wheels mounted on them and the trailers with the roll away wheels? Seems like if that's the fact, they ran while the roll away wheel trailers were produced.