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For cables, when we construct them, we include accident preventive mea-
sures, such as covering cables with rubber pads where they go under
rails.(8th cycle of RAMS).A new signalling system [6] which is a complete
duplex system, including the optical cables, has already been developed
and will be placed in a 50km radius from Tokyo Station in the near future
(1st cycle of RAMS).
4
Conclusion
In this paper, the railway signalling system was evaluated by using RAMS
for reliability evaluation of railway transportation.It became possible to set
appropriate priorities of measures by evaluating the overall railway signalling
system as there is equipment with failures that have only a small impact
even if probability of occurrence is high. Moreover, we could analyze not only
system down of equipment unit but also man-caused failures.
As a result, it became possible to take more effective measures. Signal
equipment will be continuously evaluated by RAMS technique in the future
and we will make efforts to set up appropriate conditions. In that case, we
should return to various stages of RAMS and measures should be taken.
References
1. Railway applications - Specification and demonstration of reliability, avail-
ability, maintainability and safety, IEC 62278 Ed. 1.0:2002 / EN 50126(1999)
2. S.Hiraguri: International Standard overseas railways. Trend and problem
concerning RAMS standard In: Railway and electrical technology, Vol. 16,
Reliability Engineering Association of Japan, Japan (2005)
3. East Japan Railway Company Information,
http://www.jreast.co.jp/
e/index.html
4. T.Nanya: Fault tolerant computer (in Japanese),Ohmsha,Japan (1991)
5. H.Makabe : Introduction to reliability engineering(in Japanese), Japanese
standard association (1990)
6. Y.Hirano,et.al: Development of Railway signalling System based on Network
Technology, Proc.of IEEE SMC(2005)
