[ conducting classes and study courses and providing training in the field of basic electronics and signal maintenance ]; [electrical and electronic railway equipment, namely, - ][ tuned electrical alternators; electronic amplifiers; ] [ electrical power supplies; ][ audio frequency oscillator; coded current transmitters; coded current decoding units; line circuit carrier modulators; battery charge control units; ] [audio frequency overlay track circuit receivers; ][ electrical switches; ] [electrical inductors; electrical transformers; electrical reactors;][electrical condensers;][ electrical relays; electrical relay snub units; electrical plug connectors; ][ electrical network subassemblies -, namely, resonant units, arc suppressors, interstage coupling units, electrical interference suppressors, passive networks, buffer coils and phase shift networks; ][ electrical filters, and parts therefor; ] [ electrical contactors; ] [ lightning arresters;] [ electro-mechanical audio annunciators; train communication equipment used to communicate train signals between wayside location and vehicles; telephone communication apparatus of the modulated carrier wave type, audio and video indicating call detectors therefor; voice and/or code modulated carrier communication and/or indication and/or control equipment, and components thereof -, namely, transmitters, receivers, modulators, and code repeaters; multiplex code control systems; electrical data display and data handling equipment; channel selectors for multiple indication; multi-channel cab signal controls; electrical indicators for station platform; hermetically sealed and potted transformers and/or choke coils; ] [ railway interlocking equipment used to electronically interlock the traffic flow of rail vehicles through switched sections of track; railway signaling and control equipment which conveys information from positions along the route, interlock switches and highway crossings, and provides the signaling to a traffic control facility; ][ train control systems, and parts therefor -, namely, reversing switches, electrical equipment boxes and receiver coils, office and/or field coding units, electrical field and/or line storage units, remote code indication systems, and train graph panels for centralized railway traffic control systems; electric switch and locks; electric switch locks; electrical railway slide detectors; ] [impedance bonds for railway track circuits;] [ draw bridge circuit controllers; ][ highway crossing signals; electrically operated highway crossing bells; ][ railway wayside visual motor car indicators; ][ railway wayside and/or overhead visual signals -, namely, light signals, dwarf signals and searchlight signals; locomotive cab signals; ][ electrical relay and/or filter and/or instrument cases, racks, panels and/or housings and junction and terminal boxes; alternating current pulse length recorders; carrier level meters for voice and/or code modulated carrier communication and/or indication and/or control equipment; mobile testing equipment for simulators; computers; electrical servomechanisms, and parts therefor -, namely, servomotor operated ratiometers and servomechanism analyzers; portable test equipment for testing electric circuits; screw time releases; railroad dragging equipment detectors; electrical train operation training simulators;] [electrically operated time delays and timer relay; ][ apparatus for railway classification yards -, namely, automatic track switching units, car speed controllers; rolling resistance recording and storage units, and track capacity indicators; electronic units for processing, storing and/or displaying traffic control information; portable test equipment for testing inductors; ] [ DC/AC inverters;][ audible alarms; ][ DC/DC converters; ][ radar speed sensors and controls; wheel detectors; vehicle weighing rail units; ] [rectifiers; transformers; plug-in relay mountings; timers; event recorders; ][ logic emulators; programmable remote code computer interfaces; code emulators; equipment identification devices, namely, transponder tags, transmitting and receiving antennae, electric wheel detectors, and control units to sequence the signaling and receiving of information and coordinate with vehicle positioning and detection; fixed and mobile satellite communication units;] [vehicle axle tachometers; vehicle mounted track receivers for receiving railway track signals ]; mechanically actuated railway equipment, namely, [ friction car retarders; ] mechanical railway track switch and lock movements; facing point lock railway track switch movements; [ crank stands; ] [train stops; ][ buffer type rail contactors; railway track switch valves;] railway track switch machines; [ highway crossing gates; ][ railway car retarder systems, comprised of multiple car retarders and electrical and/or electro-pneumatic controls therefor; railway interlocking equipment used to interlock the traffic flow of rail vehicles through switched sections of track ]; [ maintenance and repair services in the field of computer peripherals and electrical relays ]
