--- In STMFC@..., Anthony Thompson <thompson@...> wrote:
The FHIX cars were equipped for Half-stage Icing (thus the HI in the mark) and had fans, so your car should be so equipped and so lettered.
In the Bill Welch history The Wood Sheathed Cars of the FGEX/WFEX/BREX Freight Refrigerator Fleet: 1940-1953, he lists the "HI" in FHIX and WHIX as standing for heavy insulation.