R1A1I1L1B3U1S1
9 points
RAILBUS is validvalid
a passenger car equipped for operation on rails [n RAILBUSES, RAILBUSSES]
a passenger bus on rails [n RAILBUSES or RAILBUSSES]
a passenger car equipped for operation on rails [n RAILBUSES, RAILBUSSES]
a passenger bus on rails [n RAILBUSES or RAILBUSSES]