crossing gate mechanism
/ˈkɹɒsɪŋ ˈɡeɪt ˈmɛkənˌɪzəm/
n
English · crossing gate mechanism中文 · 道口栏木机构Español · mecanismo de la barreraFrançais · commande de barrières
意味：Box housing the mechanism that automatically lowers and raises the gate arm.