I don’t know what a Sub Bus looks like, but it’s my first SB palindrome… same backwards. Options are:

  • The Water Bus at Portsmouth’s Historic Dockyard that takes you to the Submarine Museum in Haslar.
  • An abbreviation for a Substitute Bus; replacement rail service.
  • An abbreviation for Substitutes Bus. Crikey, how big is the team?
  • A bus from which long sandwiches are sold.
  • Part of a bus
  • Something to do with electronics