A flangeway former and rail boot system where the flangeway former has an anchor for anchoring the former in surrounding material, and a groove for receiving a protrusion on the rail boot for positioning the former on the boot. The methods include steps of establishing a call connection between a terrestrial telecommunications network and a user terminal via a first gateway and at least one satellite; and while the call connection is established, coupling the user terminal to the terrestrial telecommunications network via a second gateway and at least one further satellite. In comparison with a conventional device, the threshold voltage is reduced, the channel resistance is lowered, and the drift region on-resistance is also lowered. In the detection path for the upper frequency, a series of filters suppresses signals in the lower frequency band, while the detection path for the lower frequency employs a separate series of filters to suppress signals in the upper frequency band.