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(rail transport) Of rails for railway track, welded into longer lengths, usually before they are laid, to help eliminate jointed track.
1961 March, “Talking of trains”, in Trains Illustrated, page 135:
Rail joints affect it but do not in themselves cause bad riding, which may indeed be aggravated on long-welded track.
1964 July, “Beyond the Channel: Switzerland: Long-welded rails”, in Modern Railways, page 64:
About 20 per cent of the Federal Railways' main-line track has been laid with long-welded rail by the beginning of this year; further progress is hindered by the many curves.
