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According to the Kalmbach book "F Units, The diesels that did it", there were FP7s and FP9s, but no FP B units - FPs had a slightly longer carbody to accomodate the larger steam generator. Model Power? produce a rather nice FP in N scale - It has a diecast chassis, motor with twin flywheels - only snag is that the metal body tends to rattle against the metal chassis! Does anyone make a HO scale FP? Interesting bit of trivia. No USA railroad bought FP9s - they were only sold in Canada and Saudi Arabia. E's did come before F's in that EMD were making E-Units from 1936, while the FT demonstrator only appeared in 1939 - the FT did very nicely for EMC (as they were called then) during WW2 as they were the only company allowed to produce road freight locos - this basically gave them about 5-6 years head start over their competitors! BB usually means a loco with hydraulic transmission, as opposed to BoBo which would be the same wheel arrangement but with conventional diesel-electric transmission. A1A refers to a loco with 3-axle trucks where the centre axle is unpowered and is only present to reduce axle weight - as in the E units. Hope this helps with a few of the questions here!
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