0-9, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, [Contents]

Ultimatic machine
A booking office machine dispensing and dating pre-printed tickets (mid 1950s - 1980).
Literary warrant required.
Plural form: Ultimatic machines

CL Commercial records and equipment
BT ticket issuing machine

---

<unattributed vehicle components>
A temporary heading for terms believed to describe vehicle components but for which an appropriate place in the hierarchies has not yet been found, usually because a clearer definition of the term is required.
Plural form: <unattributed vehicle components>

CL Vehicles and vehicle components
NT car wire
NT combination valve
NT contact pyrometer
NT coupling profile
NT cut-away
NT driver
NT engine plate
NT first wheel
NT header tank
NT isolating cock
NT pick up coil
NT power unit
NT quick-release valve
NT resetting cylinder
NT star valve
NT thyristor
NT tow bar
NT train set

---

<unattributed>
An artificial group heading temporarily holding terms that are either very general or currently not adequately researched and hence cannot yet be located in the appropriate hierarchy.
Plural form: <unattributed>

CL Unattributed
NT arc protection
NT arc splash protection
NT bearing profile
NT brass (bearing)
NT center pivot
NT crank handle
NT foot switch
NT hazard warning light
NT lorry plate
NT mantle testing machine
NT multiple contact switch
NT overload protection
NT pay through and recharge form
NT pre-recorded announcement
NT speech pair
NT stock notice (blank)
NT switch box
NT switch gear
NT transfer

---

unbraked vehicle
A vehicle with no brakes. Latterly such a vehicle would be very unusual and would normally be permanently coupled to a braked vehicle.
Literary warrant required.
Plural form: unbraked vehicles

CL Vehicles and vehicle components
BT <rolling stock by braking arrangements>

---

unclassified carriage
A carriage available for use by both first and second/standard class passengers.
Literary warrant required.
Plural form: unclassified carriages

UF unclassified (coach)
CL Vehicles and vehicle components
BT <passenger carriages by class>

---

unclassified (coach)
British Railways term for a coach available for use by both first and second/standard class passengers.
Warrant: The Railway Dictionary, An A-Z of Railway Terminology, Alan A Jackson, Alan Sutton Publishing, 1996
Plural form: unclassifieds (coaches)

USE unclassified carriage
CL Vehicles and vehicle components
BT <passenger carriages by class>

---

uncoupled driving motor car
Scope note required.
Literary warrant required.
Plural form: uncoupled driving motor cars

CL Vehicles and vehicle components
BT power car

---

uncoupler switch
A device used to control the air supply to the autocoupler wedge (to permit coupling and uncoupling) and to reconfigure some train circuits when the switch is in the uncoupled position.
Warrant: LUL Jargon Buster
Plural form: uncoupler switches

CL Vehicles and vehicle components
BT <autocoupler controls>

---

uncoupler unit
A device used to control the operation of the autocoupler.
Warrant: LUL Jargon Buster
Plural form: uncoupler units

CL Vehicles and vehicle components
BT <autocoupler controls>

---

uncoupler unit control
Scope note required.
Literary warrant required.
Plural form: uncoupler unit controls

CL Vehicles and vehicle components
BT <autocoupler controls>

---

uncoupling car
Scope note required.
Literary warrant required.
Plural form: uncoupling cars

CL Vehicles and vehicle components
BT <multiple units by coupling arrangements>

---

uncoupling non-driving motor car
Non-driving motor car but with equipment for driving short distances at low speeds.
Warrant: LUL Jargon Buster
Plural form: uncoupling non-driving motor cars

CL Vehicles and vehicle components
BT power car

---

uncoupling trailer
Scope note required.
Literary warrant required.
Plural form: uncoupling trailers

CL Vehicles and vehicle components
BT trailer car

---

underbridge
A bridge crossing under Railway property.
Warrant: Railtrack Jargon Buster, 1999
Plural form: underbridges

CL Built works and components
BT <bridges by relative position>

---

underframe
A wood or metal framework carrying the main body structure of a vehicle.
Warrant: The Railway Dictionary, An A-Z of Railway Terminology, Alan A Jackson, Alan Sutton Publishing, 1996
Plural form: underframes

CL Vehicles and vehicle components
BT underframe component

---

underframe component
Scope note required.
Literary warrant required.
Plural form: underframe components

CL Vehicles and vehicle components
BT running gear
NT body bolster
NT diagonal frame member
NT headstock
NT longitudinal frame member
NT middle bearer
NT solebar
NT transom
NT underframe

---

underframe system
Scope note required.
Literary warrant required.
Plural form: underframe systems

CL Vehicles and vehicle components
BT running gear

---

underground locomotive (mining)
A locomotive which is used underground in a mine.
Warrant: Greenwood & Batley Locomotives 1927-1980, A J Booth, Industrial Railway Society, 1986
Plural form: underground locomotives (mining)

CL Vehicles and vehicle components
BT <locomotives by operating environment>

---

underground passenger railway
A passenger carrying railway built below the street level in large cities to avoid congestion.
Literary warrant required.
Plural form: underground passenger railways

CL Railway types
BT underground railway
RT metro

---

underground postal railway
An underground railway operated specifically for the efficient transfer of mail between sorting offices in a built up area.
Warrant: The Post Office Railway London, D A Bayliss, Turntable Publications, 1978
Plural form: underground postal railways

CL Railway types
BT underground railway

---

underground railway
A railway built below the surface of the ground.
Warrant: Underground Railways of the World, O S Nock, A & C Black, 1973
Plural form: underground railways

CL Railway types
BT <railways by location>
NT underground passenger railway
NT underground postal railway
RT metro
RT suburban railway

---

underline bridge
A structure of at least one span of 1.8 metres or more whose main purpose is to carry rail traffic over an obstruction or gap.
Warrant: Railtrack Jargon Buster, 1999
Plural form: underline bridges

CL Built works and components
BT <bridges by relative position>

---

underseat
Scope note required.
Literary warrant required.
Plural form: underseats

CL Vehicles and vehicle components
BT <vehicle seating>

---

unfitted train
Scope note required.
Literary warrant required.
Plural form: unfitted trains

CL Vehicles and vehicle components
BT <trains by braking>

---

unfitted vehicle
A vehicle not fitted with continuous automatic brakes (but normally having manually applied brakes for securing the vehicle in sidings, etc.).
Warrant: The Railway Dictionary, An A-Z of Railway Terminology, Alan A Jackson, Alan Sutton Publishing, 1996
Plural form: unfitted vehicles

CL Vehicles and vehicle components
BT braked vehicle

---

ungated level crossing
A level crossing where no physical barrier is provided to prevent movements across the line.
Literary warrant required.
Plural form: ungated level crossings

CL Control and communications
BT <level crossings by physical protection>

---

<unidentified terms>
A temporary heading to accommodate terms that are as yet unidentified or not fully researched and hence unable to be reliably located in the appropriate hierarchy at present.
Plural form: <unidentified terms>

CL Unidentified
NT area post
NT axle dolly
NT back strap
NT ballast post
NT bolt catch
NT budget key
NT bull ring
NT bush pattern
NT car card
NT centering device
NT changeover system
NT clearance path extender
NT clip profile
NT clutch profile
NT coating system
NT colour card
NT concentric conductor
NT console ventilation system
NT container control board
NT crossing plate
NT destination number rack
NT destination plate
NT destination rack
NT fire dog
NT gauge scale
NT header panel
NT hopper head
NT Johnson coupling sleeve profile
NT lantern body
NT line contactor
NT line name plate
NT line replaceable unit
NT locomotive stop board
NT master logic unit
NT monitor swap switch
NT motorised flap unit
NT mounting board
NT multiplier
NT non-concentric conductor
NT number badge
NT optical locating bar
NT permanent-wire control
NT pitch
NT pivot block assembly and bush
NT pointer
NT pole strap
NT power semiconductor
NT power switch
NT Presspahn shield
NT protected circuit
NT roll
NT scar
NT sepex
NT sett
NT shotter transformer
NT shunt (route class)
NT slide contact box
NT spindle support casting
NT surface tracking path extender
NT swash plate engine
NT traction and auxiliary supply set
NT traction electronic unit
NT traction test switch
NT traction trip
NT traction/propulsion system
NT train borne system
NT train set-up control
NT train wire
NT transfer contact
NT trunnion end
NT unit wire
NT unprotected cable
NT washoff
NT wax thermostat
NT westcode
NT wrist band

---

<unidentified tools and equipment>
An artificial group heading temporarily holding terms for tools and equipment as yet unidentified or not fully researched and hence unable to be reliably located in the hierarchy at present.
Plural form: <unidentified tools and equipment>

CL Tools and equipment
NT boom straightener
NT holophane-edgecumbe auto-photometer
NT step gauge

---

<unidentified track>
A temporary heading to accommodate unidentified terms that are believed to belong in the Track and track components class but are as yet unidentified or not fully researched and hence unable to be reliably located in the hierarchy at present.
Plural form: <unidentified track>

CL Track and track components
NT gauge post
NT rail plate

---

<unidentified vehicle components>
A temporary heading to accommodate unidentified terms that are believed to belong in the Vehicles and vehicle components class but are as yet unidentified or not fully researched and hence unable to be reliably located in the hierarchy at present.
Plural form: <unidentified vehicle components>

CL Vehicles and vehicle components
NT autodriver box
NT bottom end
NT BSR check valve
NT side plate
NT slide box
NT traction and brake decoder
NT traction and brake encoder
NT traction and brake encoding system
NT traction inductor

---

uniflow locomotive
A locomotive using the central admission 'uniflow' steam flow system.
Warrant: Railway Technical Web Pages, Piers Connor, 2000
Plural form: uniflow locomotives

CL Vehicles and vehicle components
BT <piston driven steam locomotives>

---

Unimog
A four-wheel drive diesel-engined vehicle capable of operating on roads across country and of using railway tracks, developed by Mercedes Benz in the 1960s.
Warrant: The Railway Dictionary, An A-Z of Railway Terminology, Alan A Jackson, Alan Sutton Publishing, 1996
Plural form: Unimogs

CL Vehicles and vehicle components
BT <track maintenance vehicles>

---

unit
An electric or diesel multiple unit train consisting of two or more cars.
Warrant: Railway Technical Web Pages, Piers Connor, 2000
Plural form: units

CL Vehicles and vehicle components
BT <trains by formation>

---

unit wire
Scope note required.
Literary warrant required.
Plural form: unit wires

CL Unidentified
BT <unidentified terms>

---

unprotected cable
Scope note required.
Literary warrant required.
Plural form: unprotected cables

CL Unidentified
BT <unidentified terms>

---

unprotected circuit
The train borne portion of the traction supply wiring, running directly from the shoegear to a fuse or other protection device, and only protected by the substation circuit breakers.
Warrant: LUL Jargon Buster
Plural form: unprotected circuits

CL Vehicles and vehicle components
BT <traction current transmission components>

---

unworked point
Points not controlled from a signal box or ground frame.
Warrant: The History & Development of Railway Signalling in the British Isles, Friends of the National Railway Museum
Plural form: unworked points

CL Track and track components
BT <turnouts by operation>

---

up line
The track with a normal direction of running generally towards London and other locations as laid down in Working Timetables and Appendices.
Warrant: Railtrack Jargon Buster, 1999
Plural form: up lines

CL Track and track components
BT <running lines by direction of working>

---

up main
The main running line to or in the general direction of London, or of the company's headquarters, when there is more than one running line in that direction.
Warrant: The Railway Dictionary, An A-Z of Railway Terminology, Alan A Jackson, Alan Sutton Publishing, 1996
Plural form: up mains

CL Track and track components
BT <running lines by direction of working>

---

upper quadrant
A semaphore signal with an arm which lifts into the upper quadrant when off.
Warrant: The Railway Dictionary, An A-Z of Railway Terminology, Alan A Jackson, Alan Sutton Publishing, 1996
Plural form: upper quadrants

USE upper quadrant signal
CL Control and communications
BT semaphore signal

---

upper quadrant signal
A semaphore signal with an arm which lifts into the upper quadrant when off.
Literary warrant required.
Plural form: upper quadrant signals

UF upper quadrant
CL Control and communications
BT semaphore signal

---

upright panel
The panel between the quarter lights on a carriage body.
Warrant: Railway Carriages and Wagons: Their design and construction (reprinted articles from The Railway Engineer 1892-7), Sidney Stone, republished by Peter Kay, circa 1997.
Plural form: upright panels

CL Vehicles and vehicle components
BT body panel

---

Urbans steam tender
Scope note required.
Warrant: Articulated Locomotives, L Wiener, 1930
Plural form: Urbans steam tenders

CL Vehicles and vehicle components
BT permanent steam tender

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0-9, A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, [Contents]