Schooners at Neponset River, end of Quincy granite railroad. A wall painting by Marjorie Goodspread White in the Ships Haven Restaurant in Quincy. This railroad conveyed the granite for Bunker Hill Monument. The Boston Custom House. Minot's Ledge Lighthouse and the Charlestown State Prison. It was constructed between April and October 1826, by designer and builder, Gridley Bryant of Scituate. The railway included the world's first turntable also invented by Bryant.