I'm putting this here for want of a better thread, but does anyone have any references or materials for how American passenger rail stations were engineered in the late 19th & early 20th centuries? In particular, I'm looking for why American railways, by and large, built very low level platforms at almost every station, including major terminals when European railways, British and otherwise, largely built high level platforms, freight and otherwise during the same time period for even the minorest village "halts", cargo or otherwise. For my purposes, I'm using high level loosely - I'm ignoring that UK platform heights don't match floor heights and therefore aren't level boarding - and the various continental midi-high platform heights (550, 760mm etc) - for the moment, this is an exercise in relativity.
The bulk of the US outside of the NEC is still 8in land, which is solidly what most would consider tram height, and lower than any mainline european standard I'm aware of, even historically. The Pennsy Road seems to have been the major exception when they built NYP and others, leading to the modern 48in level boarding NEC, but much of their stations and even major terminals like South Station was low platform until the 1980s, and DC Union, which still has both high and low platforms where the transition is particularly obvious with a ramp up.