Rb 74, RB 74, Rb-74 or Rb.74 may refer to: Rubidium-74, an isotope of rubidium The Swedish designation for the AIM-9L Sidewinder air-to-air missile The Swedish designation for the AIM-9M Sidewinder air-to-air missile Service designation for the Senne Railway A regional railway route in Bavaria A regional railway route in Baden-Württemberg A regional railway route in Berlin and Brandenburg BAE Wolf, a tugboat in the Ecuadorian Navy