Patent ID: 7099754

Claim:
A signal safety apparatus for grasping a position of presence of train on the ground and on a train, which comprises: an on-ground train control part for controlling operation of a train; an on-ground communication device capable of performing communication of information by coming within a specified range; and a sending-and-receiving part capable of sending the information received by said on-ground communication device to said on-ground train control part and receiving the information sent from said on-ground train control part, wherein when an on-train communication device attached to a train comes within the specified range, said on-ground communication device receives a speed of said train from said on-train device, wherein said on-ground communication device is placed on a boundary of a block section in which only one train is allowed to be present, and in the communication between said on-ground communication device and said on-train communication device, said on-ground communication device receives a speed of said train and pre-registered identification information of said train from said on-train communication device, and wherein when the speed of said train received through said sending-and-receiving part is larger than a predetermined value, said on-ground train control part outputs a permission signal for permitting said train to move to a next neighboring block section, and judges that said block section in which the communication has been performed is in a state of absence of train.