{TAIL ~ Numerals} 421, 451 and 461 represent solenoids of the change over {HEAD ~ valves} 42, 45 and 46 
{ TAIL ~ Numerals } 421 , 451 and 461 represent solenoids of the change over { HEAD ~ valves } 42 , 45 and 46
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH