June 7, 2020 at 12:54 am #9781

princessclyne69

Participant

I have an index of recorded observations on locomotives, which centers on the late 60s to mid 70s era. What I show for the bell on GP18s is that engines from 400 to 462 have a roof-mounted bell, except 429, 433 and 454. Then 465 to 499 have side-mounted bell except 481, 484, 488, and these units have the external air filter. 505 to 533, ex 4801 to 4829, have the roof bell. So do 534 to 550, delivered after the renumbering occurred, except 548 and 550.

Watch the fans on GP18s. early ones must have been delivered with two low fans, later ones must have been delivered with two ‘high fans’, fans with shroud. This was probably part of a general EMD design change. Units that had been through a shopping could have either type in either place, basically whichever type was sent over to that unit on the day the fan housings were reinstalled.

Not all units from any of these groups were listed. Listing depended on my actually seeing a unit or having a picture, during the time I was recording this data.

RG7

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