"A Class" . . "Metropolitan Railway A Class" . "side tank locomotives" . "A class" . . . "2" . . . "1864" . . "Same design as used by Metropolitan" . "Metropolitan Railway A class" . "Metropolitan Railway A and B Class" . . "A" . "B class" . . . . "4-4-0 side tank" . . . "1870" . "Metropolitan Railway A Class" . . . "more advanced locomotives" . .