Term is used to denote system used on single lines to prevent an opposing train entering single-line stretch when this is already occupied, while it gives facilities for trains to follow each other on single line, under ordinary automatic-block protection.
Absolute permissive block on the New Zealand railways
Ry. Engr
Railway Engineer ; 48 , n 569
1927
2 pages
1 Fig.
Aufsatz (Zeitschrift)
Englisch
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