The reason of a substitute [ construct ]

Since, as for the reason which constructs the Amarube iron bridge again, the iron bridge merely became old only?It is not such a simple reason. Things are concerned with a life of residents. The Sea of Japan side of a winter season has very much snow. Depending on the case, a way cannot often be seen by heavy snow. Especially this neighborhood with many steep hills is also a danger zone where slip accidents also occur frequently by a car. For this reason, a wish of regular operation to a public transportation facility has a serious thing for local residents.