Abstract: An information transmission system includes a ground system provided to a track and an onboard system installed in a train. The ground system includes two (M=2) track antennae selected from N types of track antennae with different resonance frequencies. The two track antennae are arranged side by side in a left and right direction relative to a traveling direction of the train. When the train passes through a position where the ground system is provided, the onboard system detects the two track antennae at once and can determine the resonance frequencies of the track antennae.

Abstract: A railway vehicle safety shunt system includes a pair of axle-mounted rail wheels having outer circumferential surfaces that engage the upper surfaces of the rails, respectively, radially outwardly flange portions that engage the lateral portions of the rails, respectively, and adjacent end surfaces that are respectively engaged by a pair of spring-biased wire brushes arranged parallel with the axis of rotation of the associated rail wheel. The brushes are electrically connected by a shunt conductor, thereby to present an indication of the location of the railway vehicle at a remote vehicle position monitoring and dispatching station.

Abstract: A transportation safety apparatus and method for the detection of obstacles which lie off the line-of-sight or beyond the field of view of a moving vehicle entails shooting a laser beam through the air from a moving vehicle, capturing the beam and passing it to a fiberoptic relay which transmits a laser pulse to a distant site, and receiving a reflection thereof if the site is clear of obstacles. The pulses are received within about 10-20 microseconds per kilometer of relay length from the time of launching, permitting monitoring of the probe-site in real-time.