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| auxiliary wayside system | A backup or train control system, capable of providing full or partial automatic train protection for trains not equipped with train borne cbtc equipment, and/or trains with partially or totally i... |
| foot iron | A bracket mounted on the outside of a vehicle to aid access by the crew when boarding from the ground. also known as a "step iron". step iron; |
| accommodation bridge | - A bridge connecting two areas of land which were under common ownership but separated when the railway was built.rt
- A bridge connecting two areas of land which were under common own...
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| alley (us) | A clear track in a switching yard. (uk: marshalling yard.)uos |
| chopper control | A development in electric traction control which eliminates the need for power resistors by causing the voltage to the traction motors to be switched on and off (chopped) very rapidly during accel... |
| driving van trailer (dvt) | A development of the driving trailer which was introduced in the uk following an accident at polmadie in scotland when a diesel multiple unit struck a cow and derailed, causing the deaths of sever... |
| dragging detector | A device designed to alert a railway control centre that a train has become derailed or a part of the train is dragging on the right of way. normally consists of a bar placed across the four-foot ... |
| anticreeper (us) | A device firmly attached to the base of a rail and bearing against a crosstie (sleeper), to keep the rail from moving longitudinally under traffic. (uk: rail anchor.)uos |
| adjustment switch | - A device which allows longitudinal rail movement to dissipate thermal forces when cwr is adjacent to jointed track or other features not designed to withstand thermal forces. adjustment switch...
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| wheelset | A fixed formation of an axle with two wheels set at the correct gauge for the track. the wheels are pressed onto the axle and rotate with it as a unit. it is mounted into the bogie (or vehicle) fr... |
| slab track | A form of railway track comprising a concrete base to which the chairs carrying the rails are secured. it eliminates the need for individual "sleepers" (q.v.). |
| flat (1) | A freight wagon with no sides. known as a flat car in the us. |
| short circuiting device | A hand tool for preventing traction current from being switched on to a dc electrified line. applies only to third rail systems. generally mounted on trains and stations for use in emergency, they... |
| levelling valve | A levelling valve is used to determine the variations in vehicle weight caused by loading and unloading. it is a pneumatic device mounted on the vehicle underframe and connected to the bogie, whic... |
| static load test bed | A locomotive test facility provided to see if the performance requirements of a design are met. called a "load tank" in the us. |
| electro-diesel locomotive | A locomotive which can operate with either electric or diesel power. the motors are electric but can be supplied from the diesel driven alternator or from the line`s external power supply. the pre... |
| traction link | A means of transmitting power from the bogie to the body of a locomotive. the traction link usually consists of a steel bar attached at one end to the bogie frame and at the other end to the under... |
| push-out | A method of rescuing a failed train by using the following train or locomotive to push it to a depot or siding. requires careful management and good training of crews if what is already a long del... |
| four rail system | A now almost unique current collection system used by london underground which has separate positive and negative current rails. the same system was used by the lnwr and the mersey railway at one ... |
| motor car | A passenger vehicle in a multiple unit train which is provided with traction power equipment. |
| pilotman | - A person appointed to guide a driver of a train over a line with which he is not familiar or under special circumstances where the movement of trains is restricted.
- Person provided ...
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| sand drag | A pile of sand placed at the end of a track to absorb the energy of a train overrunning the end of the track. sometimes the same function is performed by a hydraulic buffer or other energy absorbi... |
| shore supply | A power supply provided in a workshop or yard for vehicles which are disconnected from their normal traction or auxiliary supply. special sockets or receptacles are provided on many railway vehicl... |
| motor bogie | A powered bogie. the term is usually confined to multiple unit trains so as to distinguish them from trailer (unpowered) bogies. some railways operate trains with all bogies motored. see also "bog... |
| bi-mode (u.k.) or dual-mode (u.s.) | A railway traction vehicle that can receive energy from wayside electrification or an on-board source or a combination of both. an example is a locomotive that can draw power from overhead electri... |
| autonomous traction | A railway traction vehicle that does not rely on wayside power supply (e.g., electrification or linear motor) for propulsion, for example, a steam locomotive or a diesel locomotive. |
| monobloc wheel | A railway wheel cast in a single bloom and machined to the required profile. unlike the traditional spoked wheel, the tyre is integral with the wheel and cannot be separately changed. |
| active suspension | A recent development in train ride control, active suspension uses microprocessor control to detect changes in track formation or direction and then signal changes in the suspension configuration.... |
| spring buckle | A retaining clip which wraps round the leaves of a laminated vehicle spring at the centre point. |
| automatic fare collection (afc) | A revenue collection system common on metros and urban railways which requires the passenger to buy a ticket and use it to release an entrance or exit gate to permit access to or exit from the rai... |
| straight air brake | A simple compressed air brake fitted to locomotives for use on the locomotive only. for details, see the article in the brakes page. |
| island platform | A single station platform with a track on either side, which is more efficient in facilities provision than two side platforms. it does tend to increase the land take however, because of the need ... |
| shed receptacle | A socket provided on an electric railway vehicle where a shore supply lead can be inserted to provide power when the normal traction supply is not available. usually used in sheds and workshops. |
| flat (2) | A spot on a wheel, caused by skidding or wheel slide, which causes a tapping sound as the wheel rotates and which can usually only be removed by expensive re-profiling of the wheel on a lathe or w... |
| ultrasonic flaw detection | A system for examining the condition of rails to determine the integrity of the steel. the data is collected by an electronic instrument run along the track also used to detect flaws in railway ax... |
| automatic cab signal system (acs) (us) | A system that automatically operates a display of signal aspects in the cab of a train as well as the cab warning whistle.uos |
| cab signalling | A system where signal indications are displayed to the driver in his cab, usually from a trackside induction system. cab signals may either augment existing lineside signals or replace them. cab s... |
| automatic signalling | A system whereby lineside visual signals for drivers are controlled entirely by the passage of trains using track circuits. used where there are no junctions or turnouts, which require `semi-autom... |
| blocking back | A term used to denote a queue of trains detained behind a delayed train or other obstruction. |
| centre siding | A track laid between two running lines for the purpose of reversing trains, usually beyond a station. it allows a train to reverse direction without crossing a track carrying through trains. somet... reversing siding; |
| floating slab track | A track system using a concrete base mounted on rubber pads to reduce vibration transmitted to adjacent property. a number of railways have tried it with some anecdotal evidence suggesting that th... |
| gradient post | A trackside post with two arms indicating the point where there is a change in track gradient. |
| automatic block signal (abs) | A train control subsystem based on a series of consecutive blocks governed by block signals which are controlled by the movement of trains and certain other conditions (e.g., detection of level cr... |
| gapped | A train stalled over a gap in the conductor rail of an electric railway is said to be "gapped". this occurs when the shoes on the train which collect the current have all lost contact with the cur... |
| banking locomotive | A uk term meaning a locomotive used to assist trains over an uphill section of line incorporating a long or steep `bank`. many banks had permanent allocations of `banking engines`, which were atta... |
| equaliser bar bogie | A us design of bogie, dating from the late 19th century and still popular, where the primary suspension is arranged by attaching a longitudinal steel bar to each pair of axle-boxes and depositing ... |
| turnback track | A us term for a reversing track or centre siding. |
| hostler | A us term for a small power and brake controller provided for the driver at certain positions on a locomotive or multiple unit train for shunting movements where the expense of a driver`s cab is n... |
| match wagon | A vehicle equipped with different types of couplers at each end and placed between a locomotive and train where the couplers are of different types. |
| a workshop where "lifting" is done. |
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| main reservoir pipe | Air pipe connecting all main reservoirs on a train from which supplies for pneumatic systems are drawn. connections between cars are via flexible hoses. normally, each vehicle has main reservoir p... |
| conductor rail | - An additional rail (or rails) provided on those electric railways where power is transmitted to trains from the track. often referred to as the `third rail` or `current rail` , it is normally ...
current rail; |
| p-wire control | An analogue form of electro-pneumatic brake control using a single wire carrying a pulse width modulated signal. the current level on the circuit determines the rate of brake demanded. zero curren... |
| automatic coupler | An automatic coupler allows two vehicles to be attached to each other merely by pushing the two vehicles together. there are various types and systems in use, which range from a simple automatic m... |
| buckeye coupler | An automatic coupler invented in 1879 by eli janney in the us and now used world-wide. vehicles are coupled by pushing them together and are released by a lever under the coupling head. the term b... |
| arm repeater | - An electrical indicator which shows the position of a semaphore signal arm to the controlling signalman.rt
- Electrical indicator which shows the position of a semaphore signal arm to...
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| driving trailer (dt) | An unpowered passenger vehicle with a driver`s cab used to remotely control a power car or locomotive. sometimes referred to as a driving van trailer (dvt) where the vehicle is used for luggage or... |
| commonwealth bogie | Another name for the `equaliser bar bogie`. illustration and description here. |
| abnormal heavy road load | - Any road load which falls outside the scope of the construction and use regulations because of its weight or weight distribution.rt
- Any road load which falls outside the scope of th...
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| axle brush | Axle mounted contact used to provide a return path for power circuits on electric vehicles. nowadays normally mounted on the axle end as part of the axlebox assembly. |
| h frame bogie | Bogie design where headstocks are omitted and the bolster is fixed. usually of welded, box frame construction. |
| automatic warning system (aws) | British system for alerting the driver to a signal aspect which requires action (horn for danger) or indicating a clear signal ahead (bell for green). based on a track-mounted permanent magnet wit... |
| side chains | Chains provided at vehicle ends on some railways for emergency coupling purposes in case the standard coupling breaks. |
| semi permanent coupling | Coupling between vehicles provided for normally fixed formation train sets like multiple unit consisting of a bar linked to the adjacent car underframes by pins. this form of coupling is usually o... |
| platform screen doors | Doors placed along a platform edge to separate passengers from the exposed railway. usually only used on metro systems (e.g. singapore, lille france, leningrad russia, kobe japan) where they are d... |
| lead (2) | Electric cable used in maintenance for shore supplies or wander lights. |
| notching relay | Electrical relay provided in vehicle traction power circuits using "resistance control" which monitors the rise and fall in current values and actuates the next step in the acceleration phase by p... |
| headwayhigh speed train (hst)horn (1) | Electrically or pneumatically operated warning device provided for a driver to sound at will. replaces the traditional whistle. |
| automatic route setting (system) (ars) | Electronic or relay based system which sets routes using information from a train describer and the timetable without the need for intervention by a signaller.uos |
| automatic train reporting | Electronic system for reporting train movements based on the passing of train identities using a signal panel train describer.rt+uos |
| roof dome | End cap of vehicle roof, where possible manufactured as a single piece. |
| detonators | Explosive devices carried on locomotives or trains for use in emergency situations where they are placed on the top of the running rail so that they explode to give a warning to the driver if a tr... |
| acceptance (of rolling stock) | Final part of the process to introduce new types of rolling stock, onboard systems or infrastructure components to the railway network managed by network rail.uos |
| advanced passenger train (apt) | High speed tilting train, the development of which was abandoned by british rail in the early 1980s. a version of the technology was later used by the italians who produced a tilting train design ... |
| air bags | Hollow rubber vehicle suspension devices containing compressed air and controlled to ensure pressure, and therefore body level, is maintained constant. see air suspension and secondary suspension.... |
| automatic railway inquiry systems | In europe a prototype system to provide passenger timetable information.rt |
| train line | In uk parlance, a cable running the length of a train for control or power purposes. it is connected between vehicles by a jumper. the term train line is sometimes used in the us to denote the bra... |
