Q. See question above. Is there a proscription of eating in public when traveling in a bus to a Simcha or similar?

A. Divrei Sicha (p. 527) rules that a Talmid Chacham should be stringent and not eat even when traveling in a rented bus.

Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit’a