The difference between Permanent way and Railroad track
When used as nouns, permanent way means the track and bed of a railway, whereas railroad track means a pair of formed steel rails, separated and supported usually on wooden or concrete ties or sleepers, forming a track along which flange-wheeled railroad vehicles may travel.
check bellow for the other definitions of Permanent way and Railroad track
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Permanent way as a noun (rail transport, British):
the track and bed of a railway
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Railroad track as a noun (rail transport):
A pair of formed steel rails, separated and supported usually on wooden or concrete ties or sleepers, forming a track along which flange-wheeled railroad vehicles may travel.