Raising Daughters,
You mention that there were FAs that were compressed further for truly 027. I apologize that I didn't understand who made these and what the models were. Are these the Williams FA-2? You also mention Alco FA-2, but who made these? Are these Lionel units? Thanks for more info on this.
By the way, I don't believe I would ever run a two piece engine unit on my layout. Only a single engine. Having even a 22 inch double unit running on my layout would not look good, since that alone would be almost 25% of the size of my longest straight section. :-)
Mannyrock