Briefly, yes. The blog I linked is mostly making cost comparisons between modern-day countries. Present-day vs. pre-1930's is a different world; we essentially didn't have the modern regulatory state back then.https://twitter.com/ankurrsharma/status/1105697328697147392 …
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Alon Levy estimates an average of $30-50 M/km for subway construction in the early 20th century.https://pedestrianobservations.com/2018/07/31/the-role-of-local-expertise-in-construction-costs/ …
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