Sorry for being away so long, but yes you're right it should have read upper. That comes from being an old man and too much imbibing.
K4s_PRR wrote the following post 3 hours ago: I remember in the early 50's looking out the lower half of a dutch door with the conductor.
I suspect that you meant the upper half as the lower half only opens when the upper half opens. The top half can open with the lower half closed. Lower half open would allow you to slide out and would be dangerous.