found: Cambrian Railways timetables & working timetables of 1904, 1977
found: British Steam Railway Miscellanea WWW site, 31 Mar. 2005:GWR family tree (in 1922, the GWR absorbed the Cambrian Railways)
found: BL auth. file, 31 Mar. 2005(hdg.: Cambrian Railways)
found: Brecon to Newtown, 2007:p.[4-5] (Mid-Wales Railway obtained Acts [of Parliament] in 1859 and 1860; opened in 1864; bought by the Cambrian Railways in 1904)
found: The Cambrian Railway ambulance movement, 2017:p.1 (established 1864 from the merger of the Llanidloes & Newtown Railway [no publications on British Library database], Oswestry & Newtown Railway [no publications on British Library database], Newtown & Machynlleth Railway [no publications on British Library database] and Oswestry, Ellesmere & Whitchurch Railway [no publications on British Library database]; became part of the GWR in 1923; headquarters in Oswestry)