Ferroequinately is a term that, as far as I know, has not been used anywhere else. It is a portmanteau of "ferroequinology" and "philately" and roughly means "the study of trains on stamps and of railway mail service operations.
Since I'm a philatelist and a model railroader, I'll include occasional columns about some of the items in my collection. Most of time, the columns will include data on the prototypes that are shown on the stamps and covers. So, let's explore topical collecting with trains and RPO items!