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Um guarda-chaves, também chamado de agulheiro, guarda-agulhas, sineiro ou sinaleiro ferroviário, manobreiro/manobrador, é um empregado de uma rede de transporte ferroviário que opera manualmente os pontos e sinais das agulhas ou chaves em um posto de sinais, a fim de controlar a circulação de comboios, abrindo e fechando chaves de desvio e ramais no aparelho de mudança de via, mecanismo de desvio de trens na sinalização ferroviária.