The back shunt was a second tuned circuit consisting of an inductor, a capacitor, and load resistor in series.
2.
The back shunt and signal box were removed more recently, possibly when the WMR station building was replaced in 1967.
3.
When the key is up, the arc is connected to a tuned dummy antenna called the " back shunt ".
4.
That relay used four sets of switch contacts in series for each of the two paths ( one to the antenna and one to the back shunt ).
5.
Later, after the government assumed control of the line, the station had a signal box built at the north end of the platform, a second loop and a back shunt.
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