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Electric Multiple Unit, a multiple-unit train consisting of self-propelled carriages using electricity as the motive power

High-Speed Rail, a type of rail transport that operates significantly faster than traditional rail traffic

European Rail Traffic Management System, a control system for railways that ensures interoperability throughout Europe

Global System for Mobile Communications – Railway, an international wireless communications standard for railway communication and applications

Light Rail Transit, a form of urban rail public transportation that generally has a lower capacity and speed than heavy rail and metro systems

Diesel Multiple Unit, a multiple-unit train powered by on-board diesel engines

Magnetic Levitation, a transport methodology that uses magnetic forces to levitate the train above the track to eliminate rolling resistance

Automatic Train Control, a general class of train protection systems for railways that includes ATP, ATO and ATS

Presidents’ Conference Committee, a streetcar (tram) design built in the middle of the 20th century and influential in defining the modern streetcar

Bi-Modal Unit, a rail vehicle that can operate under two different modes of power, typically diesel and electric

Multiple Unit, a self-propelled train composed of one or more carriages that can be controlled from multiple locations

Communications-Based Train Control, a railway signaling system that makes use of telecommunications between the train and trackside equipment for traffic management and infrastructure control

European Rail Traffic Management System/European Train Control System, a standard for in-cab train control and command systems in Europe

Stadtschnellbahn, translates to 'city rapid railway', a type of urban rail transit system in Germany and Austria

Transport for London, a local government body responsible for the transport system in Greater London, UK

Railhead Contamination, refers to the unwanted presence of leaves, oil, and other substances on the railhead that can lead to reduced friction and adhesion

Driver Advisory System, an in-cab computer system that provides drivers with advice to help achieve a more economical and ecological driving style

Docklands Light Railway, an automated light metro system serving the redeveloped Docklands area of London, UK

Intercity Express Train, a brand name for part of the UK's Intercity Express Programme which includes class 800/801/802 trains

Train à Grande Vitesse, translates to 'High-speed train', a French high-speed rail service

Light Emitting Diode, a semiconductor device that emits light when an electrical current is passed through it, commonly used in railway signals

Intercity-Express, a system of high-speed trains predominantly running in Germany and its surrounding countries

Train Protection & Warning System, a system on the UK railway network to stop trains from passing a signal at danger without authority

Automatic Train Operation, a system that operates trains automatically without need for driver actions

Automatic Train Protection, a type of system that prevents collisions caused by human error such as overspeeding or passing signals at danger

Automatic Train Supervision, part of the train protection system that makes sure trains adhere to their timetable

Automatic Warning System, a form of limited cab signaling and train protection system introduced in the UK to alert and brake if a train passes a signal at danger

Intercity Express Programme, a British government initiative to replace the old InterCity 125 and InterCity 225 trains with new high-speed trains

Passenger Information System, electronic information systems that provide real-time passenger information in railway stations and on board vehicles

Diesel Electric Multiple Unit, a multiple-unit train with individual diesel engines powering electric transmission

Selective Catalytic Reduction, a means of converting nitrogen oxides with the aid of a catalyst into diatomic nitrogen and water

Train Traffic Diagram, a graphical depiction of how trains move across a rail network over a specific period of time

Overhead Line Equipment, the assembly of masts, gantries and conductors that provide electric power to electric trains

High-Speed Train, generic term for trains with top speeds typically between 200 and 320 km/h

Mass Rapid Transit, an urban public transport system characterized by high capacity and frequency, and typically found in large cities