On the procedure for closing one of the tracks of double-track blocking sections and switching to single-track traffic, and on the procedure for restoring double-track traffic on such sections. In Russian /O poryadke zakrytiya odnogo iz putey dvukhputnykh blokirovochnykh uchastkov i perekhoda na odnoputnoe dvienie, a ravno i o poryadke vosstanovleniya dvukhputnogo dvieniya na takikh uchastkakh.

Published by Kursk, 1926
Condition: Used - Good Hardcover

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