imported post
It's a moot issue in MO as no firearms are allowed on any bus in the state, be that bus public or private such as a tour bus or privately chartered bus, private vehicles owned and used for only private purposes excluded:
RSMo 578.300 (definitions)
(1) "Bus", any passenger bus or coach or other motor vehicle having a seating capacity of not less than fifteen passengers operated by a bus transportation company for the purpose of carrying passengers or cargo for hire, but not to include a bus or coach utilized exclusively to transport children to and from schools;
RSMo 578.305
4. Any passenger who boards a bus with a dangerous or deadly weapon or other means capable of inflicting serious bodily injury concealed upon his person or effects is guilty of the felony of "possession and concealment of a dangerous or deadly weapon" upon a bus. Possession and concealment of a dangerous and deadly weapon by a passenger upon a bus shall be a class C felony. The provisions of this subsection shall not apply to duly elected or appointed law enforcement officers or commercial security personnel who are in possession of weapons used within the course and scope of their employment; nor shall the provisions of this subsection apply to persons who are in possession of weapons or other means of inflicting serious bodily injury with the consent of the owner of such bus, or his agent, or the lessee or bailee of such bus.
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So if you are riding a tour bus and are legally carrying CC and are legal to CC in every state you are passing through, the minute you cross into MO you are a FELON. Also, if you say wanted to use public transportation to and from work in St. Louis, one of the most dangerous cities in the country, on the Metrolink trains you are ok, but if you need to take the Metrolink bus part of the way, you are going to have to be a victim or be a felon.