Abstract: A waveguide can include a first portion configured to confine an input beam within the structure of the waveguide, and a second portion configured to collimate the beam to be projected through a combiner, to produce an image in infinity. A method of constructing an optical system for a head-up-display can include shaping a first waveguide element such that a first portion of the waveguide is configured to confine an input beam within the structure of the waveguide, and a second portion is configured to collimate the input beam. The method can include coupling the waveguide to a combiner.

Abstract: A waveguide can include a first portion configured to confine an input beam within the structure of the waveguide, and a second portion configured to collimate the beam to be projected through a combiner, to produce an image in infinity. A method of constructing an optical system for a head-up-display can include shaping a first waveguide element such that a first portion of the waveguide is configured to confine an input beam within the structure of the waveguide, and a second portion is configured to collimate the input beam. The method can include coupling the waveguide to a combiner.

Abstract: An assembly and method for updating a display assembly of a control panel is disclosed with optimal uniform illumination. In some instances, embodiments include efficient and cost effective methods for upgrading display assemblies without having to completely overhaul the electrical, mechanical, or wiring components already existing within the control panel.

Abstract: An assembly and method for updating a display assembly of a control panel is disclosed with optimal uniform illumination. In some instances, embodiments include efficient and cost effective methods for upgrading display assemblies without having to completely overhaul the electrical, mechanical, or wiring components already existing within the control panel.

Abstract: An assembly and method for updating a display assembly of a control panel is disclosed with optimal uniform illumination. In some instances, embodiments include efficient and cost effective methods for upgrading display assemblies without having to completely overhaul the electrical, mechanical, or wiring components already existing within the control panel.

Abstract: A sliding wheel detector apparatus automatically detects a sliding wheel condition of a wheel of a passing train. The apparatus includes means for parsing the cars (and trucks thereof) and segregating the same into brake valve groupings. The apparatus also includes means for determining a ratio between a wheel being evaluated and the rest of the wheels in a brake valve group. A sliding wheel will be much cooler than a properly braking wheel, and a ratio threshold is selected to detect this difference in temperature and produce an alarm.