Abstract: An apparatus for mounting a shunt or tunable joint coupler (TJC) that receives a railroad track signal from a railroad track wire. A conductive support post having a lower portion inserted into a ground surface provides above-ground mounting of the track signal terminal device. The track signal terminal device is mounted onto the support post in an electrically insulated manner. A block terminal attached to the conductive support post includes electrical contact points for electrically coupling the railroad track wire with leads from the track signal terminal device and further includes electrical contact points for electrically coupling a lightning arrestor with the conductive support post. A removable housing is attached to the conductive support post for providing an exterior encasement for the block terminal and the track signal terminal device.