The modern British Transport Police was formed by the British Transport Commission Act 1949 which combined the already-existing police forces inherited from the pre-nationalisation railways by British Railways, those forces having been previously formed by powers available under common law to parishes, landowners and other bodies to appoint constables to patrol land and/or property under their control. This is distinct from the establishment of a police force by statute, as applicable to the Metropolitan Police in 1829; BTP did not have jurisdiction on a statutory basis until the enactment of the Transport Police (Jurisdiction) Act 1994, which was subsequently amended by the Railways and Transport Safety Act 2003.