PC: GP38/GP40 "blower hatch"

[BDXT30A@xxxxxxxxxxx ( JEROME A ROSENFELD)]

GP20's and SD24's also had the buldge  on the left side of hood 
indicating unit was turbocharged where as non-turbo GP18 and SD18 did 
not have the bulge and both models used the same frames and bodies. 
EMD also made "all" GP30's appear as if they were dynamic brake 
equiped even though some lacked the feature. That did not mean they 
had dynamic brakes. Turbochargers on all EMD roadswitchers is behind 
the cab. None of the EMD data I have indicates this buldge to be used 
for air to traction motors.