In general the biz trains are used by the corporate brass (President, Vice Presidents) but also regional managers (Superintendents) and such; they are also frequently used by the marketing group to entertain shippers.
On occassion the trains are used for community events or even public excursions, but not as frequently as in the past. (UP, for example, is running two public excursion trains this year.) Years ago when I lived in Montana, BNSF brought their business train to Whitefish and hosted a class reunion for the Whitefish High School onboard the train (I don't know the particulars but if I recall, the organizer of the reunion knew someone high enough at BNSF and made it happen; BNSF is a division point and thus has many BNSF employees living there.) Another time the BNSF president was onboard the train (the only time I ever saw special agents in Whitefish, however he was quite courteous and had no problem with me taking pictures.)
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Erik Halstead - Portland, Oregon