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You also had a greater degree of superelevation in curves back then, when freight cars were grossed at 220k and max heights were well under 20'. As axle loadings and car capacity (via heightening) increased, superelevation had to be reduced, which resulted in lower speed limits around those curves. Add to that an increased emphasis on safety, elimination of double track in favor of single track with frequent sidings, lug happy diesels replacing high drivered steam, and the concept of warehousing while in transit as opposed to warehousing in an actual warehouse, and what you end up with is mile plus long trains of 15,000 tons of mostly low value commodities moving at a 25 mph average speed e.g. not quite compatible with time sensitive movements.
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