Don’t know, but both are good questions. I did the math once and as I recall, even at max full load the middle truck isn’t even close to being overloaded, so it is a sensible mutation or next generation from the standpoints of engineering, efficiency, and economics. I believe NS has a decent-sized fleet of them, but I would have to rely on a “freight car freak” like CShaveRR or Balt ACD to provide updated specifics. But these may also have the bugaboo of all articulated equipment - lack of flexibility and the lesser availability because if one unit is out of service for any reason, then so is the mated unit, even if it has nothing wrong with it !
The Thrall-built cars (many of which NS used to have and TTX still does) haven’t been duplicated in years. Thrall has been gone for years, too–but evidently Trinity wasn’t interested in continuing this design. These cars were bilevels, and not very flexible. Many NS cars have gone to shortlines that probably represent leasing companies (there are nearly 300 NS racks left, but many have been relettered NOKL or FEC).
The Gunderson Auto-Max cars have been a bit more popular, but they seem to be pretty much in exclusive service from somewhere in Mexico to somewhere along the East Coast, serving one automaker (Honda?). These were excess-height trilevels (capable of hauling a mixture of cars and vans). This may have changed in the past three or four years, as some have been converted to bilevels (“Bi-Max”), and railroads that didn’t have them before, such as UP, have gotten some. These are the ones with ventilation holes for the shackle-occupants. The conversion to bilevels probably assures that their feet won’t touch the ground for the entire journey.
Paul, I really appreciated your first response to the question; I could not help but laugh out loud. My daughter, who was visiting me, thought at first I was laughing at the quip at the bottom, but I explained to her the great interest a few years ago in the “FEMA prisoner cars.”
I will say that in my travels in the last few years, I have never noticed any articulated auto racks (not that I did not see any, but I was not looking at the trucks; they are hard to see when you are on the upper level of a Superliner)[:)] I would try to see if the cars were loaded or not…
Whoops! by the time I got to the last post, I had forgotten that it was Ed, not Paul, who posted the first response to the question. Forgive me, Ed, for crediting Paul with your response.[:$]
Perhaps another reason is the downturn in the economy meant the need for more autoracks did not exist. No reason to buy new ones, whether articulated or stand-alone, if the existing North American fleet is more than sufficient to handle the business.
Yes, I would like to see a picture of such auto racks. I missed seeing any when we went through Houston two years ago as we were on our way from Los Angeles to New Orleans (for some reason which was never explained to the passengers, it took the Sunset two hours to get away from Houston).
I;ve seen alot of the articulated auto carriers in North Bergen, NJ. I gather that they’re used by the European auto companies to haul expensive vehicles like Mercedes Benz and BMW. Thse loads would be running west from North Bergen via CSX towards Chicago and points on the West Coast.