I read with interest that the Talyllyn Railway was never nationalised - it effectively passed directly from its original private operator to its current one in 1957. Can someone tell me what other lines were left out of the 1948 nationalisation? I'm particularly interested in whether any standard gauge lines remained in private operation, or how long privately operated lines continued into the BR era. Equally interesting would be any minor railways that weren't merged into the big four in 1923. Thanks!