the train, guideway, or appurtenant equipment and will comply with the National Building Code. The system will not be operated when sustained winds exceed 90 kph.
In the above prescription, 174 kph is equivalent to 48 m/sec. In Bangalore there will be neither typhoons nor cicrone and nor hurricane. As shown in Table 2.1-3, there are no winds with speed of more than 62 kph during the past 24 years. Even in Japan where typhoons visit every summer, Shinkansen bullet trains operation have been planned for about 42 m/sec under the conditions that train operation will be stopped in case the wind speed is more than 30 m/sec. Wind speed of 48 m/sec may be too large as design requirements for the Project. It is suggested that to reduce the Project cost, this wind speed requirement may be reexamined, and that wind speed meter should be installed at every station. These wind speed meters should be electrically connected to Central Control Room and in case wind speed exceeds 90 kph, the train operation should be stopped as prescribed in PR for BERTS.
(7) Item 5.9 of PR for BERTS prescribes as follows:
5.9 PRECIPITATION
The system will be capable of normal operation during rain falling at maximum rate of 124 mm/hour. Operating trains will have adequate traction to sustain normal operations, including acceleration, service and emergency braking, and precision station stopping in these precipitation conditions. The guideway and emergency walkway design will minimize the accumulation of water.
In the above prescription, 124 mm/hr will be too large as target values allowing normal train operation. As shown in Table 2.1-2, maximum precipitation per 24 hours is 162 mm for the past 100 years.
It may be suggested that this target value may be lowered to economize the Project cost.
In Japan where the precipitation is much larger than in Bangalore, train operation will be restricted when precipitation reach 40 mm/sec.
Rainfall measurement apparatus should be installed at every station, the measured records should be transmitted to the Central Control Room, and based on the records the train dispatcher should provide the train driver with train operation control instruction depending on some target values of precipitation.
