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… 401. Location Wherever practicable, fixed signals other than switches will be located above, or to the … the track they govern. Where circumstances require that signals be otherwise placed, such conditions will be … The indications displayed on block and interlocking signals govern operation to the next signal or block end …
187.17
… specific dual control switches within the limits of Rules 566 or 567 authority that did not include Rule 566.1 … authorized by signal indication or under the provisions of rules 564 or 568 . (d) When entry is to be provided by signal … Authorities (a) Authority or permission granted by Rules 564, 567.3 or 568 may be cancelled provided the train …
60.68