Dennis,
Perlman became President and CEO of the New York Central Railroad, and it has been widely reported that he was responsible for a "no donations" of steam locomotives policy by that road. He was quoted as saying that the NYC was a "modern railroad" and he didn't want outdated steam locomotives diluting that image. The original Niagara, #6000 was set aside at Collingwood by the local shop forces, but was ordered to be scrapped when upper management learned of it. The only examples of modern NYC power preserved were two Mowhawks, one sold to the T&P, which was to be converted to appear to be a T&P engines and a second Mowhawk which had been used as a shop heating boiler and thus survived to 1960, when it was finally procurred by the National Railway Museum at St. Louis, after long and difficult negotiations. I cannot speak to Perlman's influence in eliminating Rio Grande steam.