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1. Block signals. Tabulation of statistics pertaining to signals, interlocking, automatic train control, and telegraph and telephone for transmission of train orders, as used on railroads of United States. Jan. 1, 1941; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: 1941
SuDoc number:: IC 1 blo.5:941

2. Block signals. Tabulation of statistics pertaining to signals, interlocking, automatic train control, and telegraph and telephone for transmission of train orders as used on railroads of United States, Jan. 1, 1940; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: 1940
SuDoc number:: IC 1 blo.5:940

3. Block signals. Tabulation of statistics pertaining to signals, interlocking, automatic train control, and telegraph and telephone for transmission of train orders, as used on railroads of United States, Jan. 1, 1939; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: 1939
SuDoc number:: IC 1 blo.5:939

4. Block signals. Tabulation of statistics pertaining to signals, interlocking, automatic train control, and telegraph and telephone for transmission of train orders, as used on railroads of United States, Jan. 1, 1938; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: 1938
SuDoc number:: IC 1 blo.5:938

5. Block signals. Tabulation of statistics pertaining to signals, automatic train control, and telegraph and telephone for transmission of train orders, as used on railroads of United States, Jan. 1, 1937; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: [1937.]
SuDoc number:: IC 1 blo.5:937

6. Block signals. Tabulation of statistics pertaining to signals, automatic train control, and telegraph and telephone for transmission of train orders, as used on railroads of United States, Jan. 1, 1936; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: [1936.]
SuDoc number:: IC 1 blo.5:936

7. Block signals. Tabulation of statistics pertaining to signals, automatic train control, and telegraph and telephone for transmission of train orders, as used on railroads of United States, Jan. 1, 1935; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: 1935
SuDoc number:: IC 1 blo.5:935

8. Block-signals. Tabulation of statistics pertaining to signals, automatic train control, and telegraph and telephone for transmission of train orders as used on railroads of United States, Jan. 1, 1932; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: 1932
SuDoc number:: IC 1 blo.5:932

9. Block-signals. Tabulation of statistics pertaining to signals, automatic train control, and telegraph and telephone for transmission of train orders as used on railroads of United States, Jan. 1, 1931; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: 1931
SuDoc number:: IC 1 blo.5:931

10. Block-signals. Tabulation of statistics pertaining to signals, automatic train control, and telegraph and telephone for transmission of train orders as used on railroads of United States, Jan. 1, 1930; compiled by Bureau of Safety.

Corporate/Agency Authors:: Interstate Commerce Commission
Publisher:: Interstate Commerce Commission
Date:: 1930
SuDoc number:: IC 1 blo.5:930

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