Railroad chronometer

specialized timepiece once used for safe operation of trains

en-GB/ˈɹeɪlɹəʊd kɹəˈnɒmɪtə/
en-US/ˈɹeɪlˌɹoʊd kɹəˈnɑmɪtɚ/

หมวดหมู่:

stopwatch