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Tabl e 2 . Failure Rates and Down Times of Conventional System
Interlocking device
Signal
Track circuit Point machine
5 · 10 6
0 · 10 7
2 · 10 7
9 · 10 7
Failure rate (/h)
1
.
1
.
3
.
5
.
Down time (h)
3.28
0.78
1.39
0.60
Tabl e 3 . Failure Rates and Down Times of New Concept System
Radio terminal Track circuit Point machine
4 · 10 7
2 · 10 7
9 · 10 7
Failure rate (/h)
7
.
3
.
5
.
Down time (h)
2.00
1.00
1.00
schedule. In the case of Fig.6 (a), the train headway becomes about 140
seconds, and the rate of operated train is about from 60 to 70%.
Fig. 7. Result of Simulation (In case of failure; 13T in Station 13 of Line B)
These simulations were performed for each failure case, and the expected
loss for 20 years caused by equipment failure were estimated for the combi-
nation of the model lines and systems. The results are summarised in Fig.8
(a) and the sum of the loss, initial cost and maintenance cost in Fig.8 (b).
They are expressed by relative values, with the assumption that the initial
cost to introduce a conventional system into Line A is one.
These results indicate that the loss for the new concept system is about
1.3 times of the conventional system in Line A, and about 2.1 times in Line
B. On the other hand, it is about 0.58 times in Line C. The new concept
system has no losses caused by the failure of signals and the interlocking
device, because these equipment do not exist. Especially, the loss caused by
the interlocking device is more than 50% of the total loss in the conventional
system. However, the loss caused by the failure of a newly introduced radio
terminals is greater than the reduction obtained by omitting the interlocking
device. The supposed reason for this is that the number of terminals is com-
 
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