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I'm pretty sure most subway tunnels were built pre 1930's. Wouldn't this suggest the use of brick walls (and concrete) with reinforced (rebar grid) ceilings? If memory serves (wishful thinking), the walls were alternately of brick and poured concrete; the ceilings of reinforced (rebar grid) concrete. Vertical steel uprights [studs] seperated wall sections [tangents] from the foci of the raidius (radii) on curved tracks. Also, reinforced concrete joists (ceiling) spanned wide areas at stations. How did we come to such a conundrum? Mister Beasley, please make your next project an elevated train where the scenery is less challenging...lol! Oh yes, your idea of a PCC (multi units?) is a good one. Mustn't forget the proverbial "pick pocket" with a big Irish (red nosed) cop in "hot pursuit!" Happy rails to you.
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