Brief review of Dr. Kemmann's book, describing signaling installation on elevated and underground line in Berlin, which is equipped with up-to-date automatic block and interlocking system; semaphores used on elevated and light signals underground with mechanical-trip train stops.
Signals on the Berlin subway and elevated
Ry. Signal Engr
Railway Signal Engineer ; 16 , n 2
1923
4 pages
9 Figs.
Article (Journal)
English
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