Railway Act Article 58

Electric, communication, or other wires crossing over electrified railways shall conform to the following regulations:(1) Electric, communication, or other wires with a voltage lower than that of electrified railway wires, shall pass under the railway. The depth from the track surface shall be discussed and decided by pipe and wire departments and railway institutions.(2) Electric wires with a voltage higher than that of electrified railway wires shall maintain a distance with electrified railway wires as regulated.
中文原文 鐵路法第58條
橫越電化鐵路之電力、通信等線路,應依左列規定:
一、低於電車線電壓之電力、通信或其他線路,應在鐵路下穿過。
其距離軌面之深度由管線單位與鐵路機構協商定之。
二、高於電車線電壓之電力線路,應與電車線保持規定之距離。

English translation for reference only; the Chinese text prevails. Not legal advice.