Block bell; single stroke; Stockton & Darlington Railway, c.1852, enamel plate attached reads "Railway Signal Bell - Charles V. Walker FRS Invenit". Overall: 325 mm x 310 mm x 295 mm. Railway Signal Bell - Charles V. Walker FRS Invenit 1847-1857
Telegraph block instrument and wooden back cover (detached), South Eastern Railway, Walker's type, shaped like church window, ex Bricklayers Arms. Walker's Type Telegraph Block Instrument 1812-1882