sentences:  In 1864, the population of the settlement expanded as Walsall Wood Colliery was opened, as well as another colliery in nearby Shelfield.The Walsall Wood Colliery purchased the Pelsall Colliery from Pelsall Coal & Iron Co. in 1894.The opening of the Walsall Wood Colliery saw the establishment of the first public services, including a police station and a post office.