Gunwaker

After finishing Kara no Shojo- Second Episode- today, there were still quite a few loose ends in prior games that never got resolved starting with Cartagra. 1) What really happened to Yura (from Cartagra)? The next questions are from KnS 1 true ending: 2) Who's the man on the train? 3) Who's the boy on the train and his mother ? 4) Does anyone know the name of