Operation of trains on single track under protection of automatic block signals, – Sperry, Henry Muhlenberg, 1861- [from old catalog] / / 625.165A512 / / / / 10004590
Cote
/ / 625.165A512 / / / / 10004590
Auteur
Sperry, Henry Muhlenberg, 1861- [from old catalog]
Maison d’édition
The American Association of railroad superintendents
Année
1927.
Pages
2 p.l., 20 p. front
Sujets
Railroads – Signaling – Block system Automatic block signals.