D&RGW#464

This is to John Bush Marty Knox or someone that knows.Did the #464 recieve the new hollow one piece pistons that we built for the #463 after being rebored or did it retain the old 3 piece with a bull ring and solid cast iron rings?When I worked in Chama John Bush came up with a 1948 D&RGW standard drawing for K-27 one piece hollow pistons with segmented rings.WE had them cast and Jack Campbell and myself machined the new pieces.I was just wondering if #464 got the same.When I worked at GLRR I worked with John Bush to have the pattern modified and also had a set cast for #44.