TY - GEN digital ID - 139576534 TI - Particulars of a method or methods : by self-acting apparatus to be used on railways, for obviating collisions between successive trains AU - Curtis, Charles Berwick AU - Gale Cengage Learning PY - 1841 PB - London Smith, Elder, and Co. DB - UniCat KW - Railroads -- Signaling UR - https://www.unicat.be/uniCat?func=search&query=sysid:139576534 AB - ER -