Was it a P2k chassis or the P1k? I thought the Fa1 was in the P1k line. Same chassis as the P2k but less detail on the shell. Nice work, however. For rivet counters, there are some problems with that shell, but it is fine for what Allan McClellan used to refer to as "good enough" for a layout. Athearn, Mantua, Bachmann and a bunch of the toy train manufacturers used the dies from the old Globe f-7 for their models. The Globe shell had the wrong roof curvature. You can see the difference if you put a standard r-t-r Athearn f-7 coupled to an Athearn Genesis f-7 which uses the Highliner dies. Interrestingly, the Tyco shell had the correct roof. A friend of mine in the club used to pick up Tyco shells cheap at swap meets, train shows, etc, and use the correct roof from the Tyco on the Athearn shells to make f-7s with the correct roof. The other problem with that shell for a Santa Fe modeler is the lack of a mars light on the nose. All of the red & silver f-7s were used in passenger service and had dual headlights with the upper light being a mars light. The single headlight was only used on the freight units (blue and yellow livery). The final problem for rivet counters is that it is an f-7 with steam generator details cast into the roof. There was not room for a steam generator on a standard f-7a unit. The Santa Fe solved the problem by putting steam generators in f-7b's in the space that would otherwise be occupied by a cab on the "a" units. Emd came out with an fp-7 which was 4 feet longer than the f-7 to allow room for a steam generator in the "a" unit, but Santa Fe didn't bother to buy them. They just put steam generators in their red and silver passenger units and a few of the blue and yellow "b" units that were designated for dual service to cover passenger trains when their was a shortage of red & silver power units. These blue & yellow "b"s saw a lot of service on the "Del Mar Specials" that ran during the racing season at the Del Mar race track along the "Surf Line" to San Diego.