Abstract: Systems and methods are provided for decentralized rail signaling and positive train control. A decentralized train control system may include a plurality of wayside units, configured for placement on or near tracks in a railway network, and one or more train-mounted units, each configured for use in a train operating in a railway network that support use of the decentralized train control system. Each train-mounted unit may configured to receive communicate with any wayside unit and/or train-mounted unit that comes within range, with the communicating including use of ultra-wideband (UWB) signals, and for generating control information based on the UWB signals, for use in controlling one or more functions associated with operation of the train.

Abstract: A device for carrying a removable pendant from a chain or necklace which has an aperture into which is inserted the top bar of a T-shaped member which carries the pendant. Means are provided for closure of the aperture by a movable element having a protuberance extending through said aperture, locking the pendant within the device.