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Meaning of ball signal | Babel Free

Noun CEFR B2

Definitions

A kind of mechanical signal used on early American railroads, consisting of wooden balls, painted various colors, that were hoisted up and down a pole using a rope and pulley.

historical

CEFR level

B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
See all B2 English words →

See also

ball snake ball up ball valve ball vein ball washer ball-and-pillow structure

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