There is no question that we should go back using Slumbercoaches which in my opinion it was a very big mistake to take them out of service and get rid of them. They were great cars when they were around and they made traveling by sleeper much more afordable for people who were on a tight budget,
From what I understand Amtrak took them and some of the other "Heritage Fleet " Cars out of service because they were equipped with on board septic tanks so that the toilets would have to be flushed out on the "right of way" when the trains were moving. Supposedly some new "Environmental regulations" had made it illegal to have cars like that so they had to get rid of them. They had run with railroad cars with flush toilets for years and I really don't think that they damaged the environment.
They should either rescind that stupid political regulation banning flush toilets on trains or else the could perhaps build or retrofit Slumbercoaches with septic tanks.
The Slumbercoaches were one of the best ideas that the Old Budd company had come up with for the passenger railroads in the late 1950s and it is too bad that more railroads did order them however they did run originally on the 1956 Denver Zephyr, the North Coast Limited., the Missouri Pacific Eagle, the Baltimore and Ohio National Limited and the Capital Limited plus the New York Central's 20th Century Limited, New England States , Wolverine, Ohio State Limited ,Cleveland Limited. Those were before there was an Amtrak and after there was an Amtrak they ran on some of those routes and also on some New York to Florida runs as well as the Empire Builder , the Amtrak Denver Zephyr in the early years as well as the Lake Shore and Broadway Limiteds and at times other services.