using static System.Console;
 
public class Test {
    public static void Main() {
        string texto = "_2910_0908_401 _600_ERV__P_119552_GUARITA ERV SEM ENERGIA RADIO INOPERAN_TE SEMAFOROS P TRENS E VEICLS APAGADOS_PSG TREM C SINAL DE BANDEIRA PELA GUAR_ITA";
        string[] partes = texto.Substring(1).Split('_');
        partes[0] = "_" + partes[0];
        foreach(string parte in partes) WriteLine(parte);
    }
}
 
//https://pt.stackoverflow.com/q/38521/101

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