Japanese National Railways

Nisshinbo Industries, Inc.

Yoshihiko Sato

Toshio Suzuki

Yoshihiko Ogawa

Tatsuya Hongu

Kazuhiko Nagase

Fujio Ohishi

A resilient coat for a direct connection-type tie (Danchoku tie) which is composed of a concrete tie body and a microcellular polyurethane elastomer coating layer which adheres to and coats the lower portion of the tie body to form an integral body therewith, and said microcellular polyurethane elastomer having urethane bonds and a bulk density of 0.4-0.75 g/cm.sup.3 and being prepared from the starting foamable liquid of urethane elastomer composed substantially of (a) a polyether polyol having an average number of functional groups of 2.5-4.5 and a number average molecular weight of 2000-8500, (b) a vinyl monomer-grafted polyol having an average number of functional groups of 2.5-4.0, and the graft ratio of 4-20% by weight, (c) a liquid polybutadiene polyol having hydroxyl terminal group(s), an average number of functional groups of 2.0-3.0 and a number average molecular weight of 2000-7000, (d) an organic polyisocyanate, (e) a chain extender, (f) a blowing agent, and (g) a urethanation catalyst, at such ratios that the NCO index is within the range of 90-110, and the concentration of the chain extender, based on the total amount of the five components of (a), (b), (c), (d) and (e), being 0.3.times.10.sup.-3 to 1.5.times.10.sup.-3 mol/g.

Resilient coat for tie of direct-connection type track

An automatic train control device which has a detector for detecting whether a newly received train speed signal instruction is for instructing the train to run at a lower speed than that according to an earlier signal while the train is running at a speed within the range according to the instruction received by an earlier signal, and thus finds itself running at a speed exceeding the speed according to the newly received instruction. A differential speed detector, which is connected to the signal detector, detects the excess of the train speed over the speed according to the newly received instruction. A memory outputs one braking instruction from among a plurality of stored optimum braking patterns to a device which controls the application of the brake according to the output from the memory, the memory output being in response to an excess train speed.

Automatic train control device

Growing community of inventors

Chiba, Japan

Yoshihiko Sato