Railways (signal arrangements and systems of working). Return (in pursuance of "the Railway Regulation Act (return of signal arrangements, working, &c.), 1873,") by railway companies in the United Kingdom relative to (1.) the interlocking and concentrating of signal and point levers, &c., and to (2.) the system of systems upon which the lines of railway under their control were worked, on 31st December 1883 [electronic resource].