7j43kThat is incorrect.
"One difference between pessimists and optimists is that while pessimists are more often right, optimists have far more fun."
The following is a direct quote from this site; it also has some pictures that verify the location. “The drawing show the air horn mounted on the cab roof. GN had in installed just ahead of the radiator cooling fans. http://www.mtmuseum.org/roster.php?page=gn325 Cheers, the Bear.
http://www.mtmuseum.org/roster.php?page=gn325
That is incorrect.
The GN's SDP40's had their fans mounted between the first and second radiator fans. This was typical practice for GN at the time.
Photos of BN SDP40's show the horns in this position also. Sometimes. And also on the cab roof, but towards the rear. Sometimes. BN MAY have mounted the horns ahead of the radiator cooling fans. Sometimes. But I couldn't turn up a picture.
I HAVE seen a BNSF SDP40 with horns in this position.
Ed
Got another one for the forums: Where exactly does the air horn on an SDP40 belong? The model I have has it going on the cab. A picture that I have seen of the BN Bicentennial Unit (1976) has it appearing to be between the 1st and 2nd fans on the rear of the engine (behind the dynamic brake hatch). Given that this engine was a GN-only prototype, I would tend to believe the picture, but anything is possible.
As usual, any help the forums can provide would be welcomed.