British WWI military mail in Egypt: 20 MY 1916 stampless (OAS) civilian stationary cv ex FPO T53 (53rd Welsh Div. Train, WWF Egypt) to APB ALEXANDRIA, tied by rare DC Proud-D2 pmk (in use only 3 weeks: 7-24 May); officer-endorsed & passed censor; b/s next day ALEXANDRIA-E civilian PO arr.; slit open at top. "Divisional Train" provided horse-drawn transport for Div.: usually a small 'Train HQ', 'HQ Cpy', 3x Horse 'Transport Cpys' + contingent of other troops ("Army Troops").