brotherhood of railroad signalmen铁路信号工人兄弟会
signalman-signalmen信号员
There is a positive relationship between the intelligence of signalmen and their performance level, signalmen at different positions differ in other test.
结果通信兵整体智力与专业水平呈正相关，但其它测验通信兵不同岗位人员与专业水平相关关系存在差异。
参考来源 - 通信兵职业心理适宜性研究N-COUNT（可数名词） A signalman is a person whose job is to control the signals on a particular section of a railway. (铁路段上的)信号工