At least 48 cases of problems with the circuit breaker not going down in the five years up to last year. Reasons include rust, leaves that were stuck to the rails, heat and other cases.
Experts have pointed out, ``This could lead to a major accident, and if we don't take measures, there is a risk that the number of cases will increase in the future'' Ministry of Land, Infrastructure, Transport and Tourism “Number of cases that cannot be ignored," it said.