Device in JR Shibuya Station in 2020 November
This device existed beside the E235 series shown in “JR Yamanote Line E235 Series Train at Shibuya Station in 2020 November.”
With some googling, I have found that the device is an “impedance bond.” It separates two types of currents sent through the rails: power and sensor output to tell existence of a train to control traffic signals. In Tokyo area, JR East uses direct current for power and alternating current for train existence signal. The impedance bond passes the direct current to the next rail, but blocks the alternating current with the frequency used for the train existence signal.
The device has a logo with overlapping “N” and “S.” It is the symbol of Nippon Signal co., Ltd., a railroad equipment manufacturer.
Device in JR Shibuya Station in 2020 November
This device existed beside the E235 series shown in “JR Yamanote Line E235 Series Train at Shibuya Station in 2020 November.”
With some googling, I have found that the device is an “impedance bond.” It separates two types of currents sent through the rails: power and sensor output to tell existence of a train to control traffic signals. In Tokyo area, JR East uses direct current for power and alternating current for train existence signal. The impedance bond passes the direct current to the next rail, but blocks the alternating current with the frequency used for the train existence signal.
The device has a logo with overlapping “N” and “S.” It is the symbol of Nippon Signal co., Ltd., a railroad equipment manufacturer.