The Midland Great Western Railway (MGWR) was the third largest Irish gauge (1,600 mm (5 ft 3 in)) railway company in Ireland. It was incorporated in 1845 and absorbed into the Great Southern Railways in 1924. At its peak the MGWR had a network of 538 miles (866 km), making it Ireland's third largest network after the Great Southern and Western Railway and the Great Northern Railway of Ireland. The MGWR served part of Leinster, County Cavan in Ulster and much of Connacht. Its network was entirely within what in 1922 became the Irish Free State.