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E&H: Elderly and Handicapped (TRB1)

EAP: Employee Assistance Program (FHWA10)

EARS: En Route Analysis and Reporting System (FAA19)

Earth Surface: The outermost surface of the land and waters of the planet. (DOI4)

EARTS: En Route Automated Radar Tracking System (FAA4) (FAA19)

EAS: Equivalent Airspeed (14CFR1)

EAT: External Air Transport (MTMC1)

ECAC: European Civil Aviation Conference (FAA1)

ECDIS: Electronic Chart Display Information System (USCG5)

ECH: Movement Echelon (MTMC1)

Economies of Scale: Cost reductions or productivity efficiencies achieved through size-optimization in relation to operational circumstances. For example, commodity freight rates usually decline as the volume of cargo tonnage shipped increases. (MARAD1)

Economy: Transport service established for the carriage of passengers at fares and quality of service below that of coach service. (BTS5)

ECOSOC: Committee of Experts On the Transport of Dangerous Goods of the United Nations Economic and Social Council (RSPA1)

ECPC: Economic Classification Policy Committee (BTS8)

ECVFP: Expanded Charted Visual Flight Procedures (FAA17)

ED: Effective Diameter (TII1)

EDCT: Estimated Departure Clearance Time (FAA4) (FAA8)

EDD: Explosives Detection Devices (FAA1)

Eddy: A current running contrary to the main current, causing water turbulence, e.g., below the bridge pier where a swift current is passing through, or below a bar or point. (TNDOT1)

Eddy Above and Below: Channel report term meaning that eddies should be expected both above and below the object mentioned in the marks, such as dikes, top and bottom of crossings, sunken obstructions, etc.; tricky water. (TNDOT1)

Eddy Extends Way Out: Term meaning that an eddy extends from the shore or the dike into or across the range formed by this set of marks, or extends one-third or more across the river. (TNDOT1)

Eddy Makes Out from Right (Left) Shore: Term indicating that one should watch for eddy along the shore designated in this set of marks. (TNDOT1)

EDI: Electronic Data Interchange (BTS8) (RSPA1)

EDP: Expedite Departure Path (FAA17)

EDS: Explosive Detection Systems (FAA7) (FAA1)

EDSS: Equipment Deployment and Storage System (MTMC1)

EFAS: En Route Flight Advisory Service (FAA8)

EFC: Expect Further Clearance (FAA4)

Effective Intensity: That intensity of a light in candela as defined by the Illuminating Engineering Society's Guide for Calculating the Effective Intensity of Flashing Signal Lights, November, 1964. (49CFR221)

Effective Locking Device: A manually operated switch or derail which is 1) Vandal resistant; 2) Tamper resistant; and 3) Capable of being locked and unlocked only by the class, craft or group of employees for whom the protection is being provided. (49CFR218)

EFIS: Electronic Flight Information Systems (FAA6)

EHTR: Emergency Highway Traffic Regulation (MTMC1)

EIA: Energy Information Administration (OFR1)

EIS: Environmental Impact Statement (FAA17)

Ejection: Refers to occupants being totally or partially thrown from the vehicle as a result of an impact or rollover. (NHTSA2) (NHTSA3)

Electric Lock: [with respect to rail operations] A device to prevent or restrict the movement of a lever, a switch or a movable bridge, unless the locking member is withdrawn by an electrical device such as an electromagnet, solenoid or motor. (49CFR236)

Electric Locking: [with respect to rail operations] The combination of one or more electric locks and controlling circuits by means of which levers of an interlocking machine, or switches or other units operated in connection with signaling and interlocking, are secured against operation under certain conditions. (49CFR236)

Electric System: Physically connected generation, transmission, and distribution facilities operated as an integrated unit under one central management or operating supervision. (DOE5)

Electricity: (See also Gigawatt, Kilowatt, Megawatt) A form of energy generated by friction, induction, or chemical change that is caused by the presence and motion of elementary charged particles of which matter consists. (DOE5)

Electro-Pneumatic Switch: A switch operated by an electro-pneumatic switch-and-lock movement. (49CFR236)

Electro-Pneumatic Valve: A valve electrically operated which, when operated, will permit or prevent passage of air. (49CFR236)

Elevated on Fill: Rail transit way above surface level fill. Transition segments above surface level on fill are included. (FTA1)

Elevated on Structure: Rail transit way above surface level on structure. Transition segments above surface level on structures are included. (FTA1)

Elevated Rail Subway: Includes elevated and subway trains in a city. (FHWA3)

Elevated Temperature Material: A material which, when offered for transportation or transported in a bulk packaging: 1) Is in a liquid phase and at a temperature at or above 100 degrees C (212 degrees F); 2) Is in a liquid phase with a flash point at or above 37.8 degrees C (100 degrees F) that is intentionally heated and offered for transportation or transported at or above its flash point; or 3) Is in a solid phase and at a temperature at or above 240 degrees C (464 degrees F). (49CFR171)

Elevator: Hydraulic end-gate. (ATA1)

ELP: El Paso International Airport (FAA11)

ELT: Emergency Locator Transmitter (FAA4) (FAA8)

ELT: Enforcement of Laws and Treaties (USCG5)

Embankment: A raised structure of earth, ground, etc. (DOI4)

EMC: Electromagnetic Compatibility (FAA19)

Emergency: A deviation from normal operation, a structural failure, or severe environmental conditions that probably would cause harm to people or property. (49CFR193)

Emergency: Any hurricane, tornado, storm (e.g. thunderstorm, snowstorm, icestorm, blizzard, sandstorm, etc.), high water, wind-driven water, tidal wave, tsunami, earthquake, volcanic eruption, mud slide, drought, forest fire, explosion, blackout or other occurrence, natural or man-made, which interrupts the delivery of essential services (such as, electricity, medical care, sewer, water, telecommunications, and telecommunication transmissions) or essential supplies (such as, food and fuel) or otherwise immediately threatens human life or public welfare, provided such hurricane, tornado, or other event results in: a) A declaration of an emergency by the President of the United States, the Governor of a State, or their authorized representatives having authority to declare emergencies; by the Regional Director of Motor Carriers for the region in which the occurrence happens; or by other Federal, State or local government officials having authority to declare emergencies, or b) A request by a police officer for tow trucks to move wrecked or disabled vehicles. (49CFR390)

Emergency Brake: A mechanism designed to stop a motor vehicle after a failure of the service brake system. (49CFR571)

Emergency Brake System: A mechanism designed to stop a vehicle after a single failure occurs in the service brake system of a part designed to contain compressed air or brake fluid or vacuum (except failure of a common valve, manifold brake fluid housing or brake chamber housing). (49CFR393)

Emergency Contingency Vehicles: Revenue vehicles placed in an inactive contingency fleet for energy or other local emergencies after the revenue vehicles have reached the end of their normal minimum useful life. The vehicles must be properly stored and maintained, and the Emergency Contingency Plan must be approved by FTA. Substantial changes to the plan (10% change in fleet) require re-approval by FTA. (FTA1)

Emergency Locator Transmitter (ELT): A radio transmitter attached to the aircraft structure which operates from its own power source on 121.5 MHz and 243.0 MHz. It aids in locating downed aircraft by radiating a downward sweeping audio tone, 2-4 times per second. It is designed to function without human action after an accident. (FAA4) (FAA8)

Emergency Opening Window: That segment of a side facing glazing location which has been designed to permit rapid and easy removal during a crisis situation. (49CFR223)

Emergency Relief: An operation in which a motor carrier or driver of a commercial motor vehicle is providing direct assistance to supplement State and local efforts and capabilities to save lives or property or to protect public health and safety as a result of an emergency. (49CFR390)

EMI: Emergency Management Institute (RSPA1)

Emission Standards: Standards for the levels of pollutants emitted from automobiles and trucks. Congress established the first standards in the Clean Air Act of 1963. Currently, standards are set for four vehicle classes - automobiles, light trucks, heavy duty gasoline trucks, and heavy-duty diesel trucks. (DOE6)

Employee: 1) A driver of a commercial motor vehicle (including an independent contractor while in the course of operating a commercial motor vehicle); 2) A mechanic; 3) A freight handler; 4) Any individual, other than an employee, who is employed by an employer and who in the course of his or her employment directly affects commercial motor vehicle safety, but such term does not include an employee of the United States, any State, any political subdivision of a State, or any agency established under a compact between States and approved by the Congress of the United States who is acting within the course of such employment. (49CFR390)

Employee: An individual who is compensated by the transit agency and whose expense is reported in object class 501 labor. (FTA1)

Employee Hours: The number of hours worked by all employees of the railroad during the previous calendar year. (49CFR245)

Employee Human Factor: (See also Human Factor) Includes any of the accident causes signified by the rail equipment accident/incident cause codes listed under "Train Operation-Human Factors" in the current "Federal Railroad Administration (FRA) Guide for Preparing Accident/Incident Reports," except for Cause Code 506. (49CFR225)

Employee Not On Duty: A railroad employee who is on railroad property for a purpose connected with his or her employment or with other railroad permission, but who is not engaged in rail operations for financial or other compensation. (FRA3)

Employee On Duty (Class A): Those persons who are engaged in the operation of a railroad. Ordinarily the fact that the employee is or is not under pay will determine whether he or she is "on duty". However, employees on railroad property while on rest or meal periods, "training time", or doing work which they are expected to do, but actually perform before pay starts, must be considered as "employees on duty." (FRA2)

Employee On Duty (Class B): Those employees who are on railroad property for purposes connected with their employment or with other railroad permission, but who are not "on-duty" as defined above. (FRA2)

Employer: Any person engaged in a business affecting interstate commerce who owns or leases a commercial motor vehicle in connection with that business, or assigns employees to operate it, but such terms does not include the United States, any State, any political subdivision of a State, or an agency established under a compact between States approved by the Congress of the United States. (49CFR390)

Empty Car Mile: An empty car mile is a mile run by a freight car without a load. In the case of intermodal movements, the car miles generated will be loaded or empty depending on whether the trailers/containers are moved with or without a waybill, respectively. (AAR1)

EMR: Electromagnetic Radiation (NHTSA5)

EMS: Emergency Medical Services (NHTSA6)

EMSAW: En Route Minimum Safe Altitude Warning (FAA4) (FAA8)

EMSIS: Emergency Shipping Information System (MARAD4)

EMU: Electric Multiple-Unit Car (TRB1)

En Route: One of three phases of flight services (terminal, en route, oceanic). En route service is provided outside of terminal airspace and is exclusive of oceanic control. (FAA8)

En Route Air Traffic Control Service: Air traffic control service provided for aircraft on Instrument Flight Rules (IFR) flight plans, generally by Air Route Traffic Control Center (ARTCC), when these aircraft are operating between departure and destination terminal areas. When equipment capabilities and controller workload permit, certain advisory/assistance services may be provided to Visual Flight Rules (VFR) aircraft. (FAA4) (FAA8)

En Route Center: An Air Route Traffic Control Center. (FAA3)

En Route Descent: Descent from the en route cruising altitude which takes place along the route of flight. (FAA4)

En Route Facility Activity: Total Instrument Flight Rules aircraft handled ; (2 x departures) + Domestic and Oceanic Overflights. (FAA3)

En Route High Altitude Charts: Provide aeronautical information for en route instrument navigation (IFR) in the high altitude stratum. Information includes the portrayal of jet routes, identification and frequencies of radio aids, selected airports, distances, time zones, special uses airspaces, and related information. (FAA4)

En Route Low Altitude Charts: Provide aeronautical information for en route instrument navigation (IFR) in the low altitude stratum. Information includes the portrayal of airways, limits of controlled airspace, position identification and frequencies of radio aids, selected airports, minimum en route and minimum obstruction clearance altitudes, airway distances, reporting points, restricted areas, and related data. Area charts, which are a part of this series, furnish terminal data at a larger scale in congested areas. (FAA4)

En Route Minimum Safe Altitude Warning: A function of the National Airspace System (NAS) Stage A en route computer that aids the controller by alerting him when a tracked aircraft is below or predicted by the computer to go below a predetermined minimum Instrument Flight Rules (IFR) altitude (MIA). (FAA4) (FAA8)

En Route Spacing Program: A program designed to assist the exit sector in achieving the required in trail spacing. (FAA4)

End Facing Glazing Location: Any location where a line perpendicular to the plane of the glazing material makes a horizontal angle of 50 degrees or less with the centerline of the locomotive, caboose or passenger car. Any location which, due to curvature of the glazing material, can meet the criteria for either a front facing location or a side facing location shall be considered a front facing location. (49CFR223)

End-Use Energy Consumption: Primary end-use energy consumption is the sum of fossil fuel consumption by the four end-use sectors (residential, commercial, industrial, and transportation) and generation of hydroelectric power by nonelectric utilities. Net end-use energy consumption includes electric utility sales to those sectors but excludes electrical system energy losses. Total end-use energy consumption includes both electric utility sales to the four end-use sectors and electrical system energy losses. (DOE3)

End-Use Energy Consumption: The sum of fossil fuel consumption by the four end-use sectors (residential, commercial, industrial, and transportation) plus electric utility sales to those sectors and generation of hydroelectric power by nonelectric utilities. Net end-use energy consumption excludes electrical system energy losses. Total end-use energy consumption includes electrical system energy losses. (DOE5)

End-Use Sectors: The residential, commercial, industrial, and transportation sectors of the economy. (DOE3)

Ending Milepost: The continuous milepost notation, to the nearest 0.01 mile that marks the end of any road or trail segment. (DOI2)

Endorsement: An authorization to an individual's commercial driver's license (CDL) required to permit the individual to operate certain types of commercial motor vehicles. (49CFR383)

Endorsement: An amendment to an insurance policy. (49CFR387)

Energy: The capacity for doing work as measured by the capability of doing work (potential energy) or the conversion of this capability to motion (kinetic energy). Energy has several forms, some of which are easily convertible and can be changed to another form useful for work. Most of the world's convertible energy comes from fossil fuels that are burned to produce heat that is then used as a transfer medium to mechanical or other means in order to accomplish tasks. Electrical energy is usually measured in kilowatt hours, while heat energy is usually measured in British thermal units. (DOE3) (DOE5)

Energy Capacity: Measured in kilowatt hours. The energy delivered by the battery, when tested at C/3 discharge rate, up to termination of discharge specified by the battery manufacturer. The required acceleration power must be delivered by the battery at any point up to 80% of the battery's energy capacity rating. (DOE6)

Energy Consumption: The use of energy as a source of heat or power or as an input in the manufacturing process. (DOE3)

Energy Efficiency: In reference to transportation, the inverse of energy intensiveness: the ratio of outputs from a process to the energy inputs; for example, miles traveled per gallon of fuel (mpg). (DOE6)

Energy Efficient Motors: Are also known as "high-efficiency motors" and "premium motors." They are virtually interchangeable with standard motors, but differences in construction make them more energy efficient. (DOE5)

Energy Information Administration (EIA): An independent agency within the U.S. Department of Energy that develops surveys, collects energy data, and analyzes and models energy issues. The Agency must meet the requests of Congress, other elements within the Department of Energy, Federal Energy Regulatory Commission, the Executive Branch, its own independent needs, and assist the general public, or other interest groups, without taking a policy position. (DOE5)

Energy Intensity: In reference to transportation, the ratio of energy inputs to a process to the useful outputs form that process; for example, gallons of fuel per passenger-mile or Btu per ton-mile. (DOE6)

Energy Source: A substance, such as petroleum, natural gas, or coal, that supplies heat or power. In Energy Information Administration reports, electricity and renewable forms of energy, such as biomass, geothermal, wind, and solar, are considered to be energy sources. (DOE3) (DOE5)

Engine: A locomotive propelled by any form of energy and used by a railroad. (49CFR171)

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