Series Number Id: UNKNOWN. Sheet number: . Enemy railway intelligence map - printed at GHQ at end of war. "Printing Coy. R.E., W.O.B./2426." Grey and blue base map with black overprint. Shows 2 classes of railways, and "railways reported dismantled by two independent sources"., Location: Research Collections; Fonds: WW1 Trench Maps: France; Box number: PC19; envelope_number: 599.