ATS alarm showed EB applied at track cir3511, NW cuit NW548 due to train moved without authorisation. TC repo rted EB applied due to 'A' side cab door unable to latch pro perly and opened up while train departing station platform. ~~~~~ ATS alarm showed EB applied at track cir    Checked #3511-A side cab door top latch overlap more than 6mm ,satis.Checked DSS,satis.Checked door guide rail,no FOD observed,satis.D operation opening/closing,no obstruction,satis.Carried out cab door tug test,DIR remained extinguished,satis.Carried out the same checks for the other cab doors,satis. Done by Joshua. 13/12/21