Because the market O/48 for contemporary stuff is too small. I'm going to attempt lengthening MTH 48' spine cars to 53'. 48' stuff came and went in the real world after only a few years with the introduction of 53' stuff. There is still some 45' stuff out there for International shipping but with the recent introduction of 53' International shipping I expect it will be 20' 40' and 53' only in the near future.
I think for the foreseeable future the availability of stuff from the past 30 years in the real world will disappear as Atlas focuses on the old MTH stuff they bought. The 53' well cars are off the menu and their Trinity hoppers appear to be in the same boat.
