@article{Lupal2015development,
author={Lupal, N.V.},
title={Development of signaling, interlocking and line-block in the pre-reform period (before 1861)},
journal={Transport automation research},
publisher={FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"},
year={2015},
pages={212-229},
volume={1},
issue={2},
}