Features on sheet 21.03 include St John’s church, part of town centre, Londonderry Railway with Seaham Colliery and Seaham stations, Londonderry Engine Works, Wagon Works, Dene House, part of South Hetton Railway, Rainton & Seaham Railway including Seaham Bank incline, Dawdon Hall, Dawdon Dene, most of New Seaham, Seaham Colliery, Miners Hall, Colliery Inn, Brick Works etc.