signal tower

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Noun1.signal tower - a building from which signals are sent to control the movements of railway trains
building, edifice - a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"
Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom
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References in periodicals archive ?
(We recognize that our study included no control (non-chilled) group, but this was not feasible as the interlocking tower trays prevented sampling lies without chilling).
It will also shift a hotel, originally planned for the scrapped tower, onto the corner of Houston and Mercer Streets, as part of a mixed-use "zipper building." That structure, made up of interlocking towers on a four-to-five-story podium that resemble the teeth of a zipper, is designed to have ground floor retail, an underground gym, classrooms and up to 1,000 student beds.