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RRR (Reinforced Railroad/Road with Rigid Facing) construction method
This method is to construct permanent retaining walls having vertical wall face by reinforcing the backfill soil with a geotextile and by using a full-height rigid facing. The area to be occupied for railways can be reduced considerably by this method compared to conventional embankment with gentle slope. The wall constructed by RRR method exhibited high seismic stability during 1995 Hyogo-ken Nambu earthquake.
Concept of RRR construction method
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Radish anchor construction method
The radish anchor construction method can be used as a means to steepen the slope of embankments as reinforcement for strengthening embankment against earthquake or heavy rainfall. As the method produces new land from existing embankments, it is widely used in large cities for the effective use of land resources.
Application of radish anchor construction work (Sakuranomiya, Osaka)
Concept of radish anchor construction method
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Ladder track
The RTRI has developed a ballasted ladder track that effectively suppresses ballast settlement and cuts maintenance costs, and a floating ladder track that significantly reduces structure-born noise. The RTRI is also promoting research on reducing steel bridge noise using the floating ladder track.
Ballasted ladder track | 
Floating ladder track |
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Overhead rigid conductor line for tunnels with a small sectional area
A catenary contact line of complicated structure, called the  -contact line, is used for tunnels with a small sectional area, and requires a high level of labor to maintain. In cooperation with JR East, the RTRI has therefore developed a new overhead rigid conductor line that can be used in small spaces.
Aluminum stack overhead rigid conductor line
Overhead rigid conductor line and catenary contact line
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Computer and Microwave Balise-Aided Train control system (COMBAT)
The RTRI has adopted the Balise radio detector for train detection to solve problems related to track circuits. A system has also been developed to centralize the interlocking and block functions along the entire length of a line to reduce the costs of introduction and maintenance and improve the efficiency of train operation.
Microwave Balise-aided train detection
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Automatic ultrasonic test equipment for the hollow axles in conventional trains
To improve the efficiency of axle flaw inspection in vehicles for conventional lines, the RTRI has developed automatic ultrasonic test equipment for hollow axles with a bore diameter of 30mm. The newly developed equipment improves the precision of flaw inspection, and readily automates inspection requiring particular attention when manually implemented.
Image of a hollow axle in conventional trains and ultrasonic flaw inspection
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Existing concrete structure soundness-diagnosing system
The RTRI has developed a structure soundness evaluation system to efficiently maintain and manage existing concrete structures. The system attaches importance to ease-of-handling in the field, and is applicable to visual inspection, measurement and evaluation of durability and the load bearing capacity of structures.
Sampling a specimen to measure the concentration of chloride ions
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Micro LABOCS
This is a software package developed by the RTRI and used in a number of railway companies to analyze and process time-series data concerning railway technologies such as track irregularities and vehicle vibrations from various angles.
An example of the chart window of Micro LABOCS
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A system to automatically generate drawings of railway facilities
The RTRI has developed a computer program to automatically generate drawings of railway facilities for maintenance and management, based on the attribute data contained in management ledgers. The program reduces the work involved in generating drawings and maintaining management ledgers, and ensures the efficient and correct management of railway facilities.
Display of facility attributes and related information
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