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The early GP18s (1961 numbers 500-529) were delivered with high nose and a roof-mounted bell behind the cab on the fireman’s side. So were the later GP18s built with Blomberg trucks.
[attachment=3:1s74gj98]46-26 Apr 70.tif[/attachment:1s74gj98]
The 400 series engines built with trade-in Alco trucks is more complicated. Some had this roof-mounted bell, apparently the early ones, while later ones had a more typical (of EMD) bell on the side of the hood near the roof.
[attachment=2:1s74gj98]46-25 Apr 70.tif[/attachment:1s74gj98]
As for the horns, most non-rebuilt GP7s had a single-chime horn on the short hood in front of the cab, and another one on the roof facing into the forward exhaust stack.
[attachment=1:1s74gj98]65-31 Dec 70.tif[/attachment:1s74gj98]
Low-nose units, whether rebuilt or original EMD, typically had the horns on the cab roof, with the engineer’s side one facing forward and the other facing rearward. Some rebuilt geeps had the rear-facing horn still in the original position, with the forward-facing horn on the cab roof.
[attachment=0:1s74gj98]46-06 Apr 70.tif[/attachment:1s74gj98]
There were a few oddballs, as could be expected with MoPac, but not many.
Ron Merrick
