On the map, again Back to an Ordnance Survey anomaly Published at 11:28 am on April 3rd, 2022 Filed under: In With The Old, Geekery, Trains. Keyword noise: maps, Ordnance Survey, Lincolnshire, North Lincolnshire, North East Lincolnshire, Waltham, New Waltham, railways, trains, Lincolnshire Potato Railways, RAF Grimsby, RAF Waltham, Royal Air Force.