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FP45 Diesel Locomotive
Baltimore & Ohio
No. 8323

FP45 Diesel Locomotive
Chessie System
No. 8321

FP45 Diesel Locomotive
No. 8322

FP45 Diesel Locomotive
No. 8320

This FP45 locomotive model surfaces in the Life-Like line in the middle 1980s.  Life-Like catalogs an Undecorated example, plus three roadnames: Baltimore & Ohio; Chessie System; and Pennsylvania.
Made in Yugoslovia by Mehano, this FP-45 was also found in the AHM line in the 1970s and was imported again in early 2006 by IHC with some revisions. 
Though not many prototype examples existed on American rails, the FP-45 did find itself sized down to 1/87th for HO-Scale a number of times.  FP-45's have been available over the years from AHM, Athearn, Lima, Mehano, Model Power-PMI, and this example sold by Life-Like. 
The Model Power-PMI featured swinging front and rear pilots that were part of the trucks.  The Model Power-PMI example also cast the cab steps into the truck sideframes.  The Model Power-PMI FP-45 was made by Lima.  Lima also supplied this model for a run of AHM FP-45's and it has been seen in Lima's own packaging.
Despite numerous model examples, Amtrak never owned FP-45s.  Only the Santa Fe and Milwaukee Road counted themselves among the original late '60s buyers of this cowled EMD diesel.
For further information regarding HO-scale FP-45 models, see the AHM HO-Scale Trains Resource and the pages detailing that company's pair of FP-45 offerings.