Just got the new MTL two bay hopper. The model has AAR designation of FM, which makes no sense. I checked in the "Frisco/Katy Color Guide to Freight Equipment" and on page 94 there is a photo of 90941 (model is 90950 thus from the same series) the AAR designation does look like FM, but the caption says HM. Under a magnifying glass it looks like the "F" is really an "H" with the right leg worn off. I am guessing that MTL misread the AAR designation. Anyone know for sure?