W Glossary of rail transport terms
a water gauge
a device showing level of water in boiler
way car
an alternate term caboose used chicago, burlington , quincy railroad, chicago , north western railway, , atchison, topeka , santa fe railway
way freight
see local train.
wayobjects or wayside objects
trackside objects or structures @ wayside or beside rail tracks within right-of-way, such railway signals, third rails, overhead lines , supports, electrification systems, platforms, or boom barriers
wayside
trackside
well tank
a type of tank locomotive. water tank mounted between frame plates, beneath cab , boiler.
well wagon (uic)
a flat wagon depressed centre used carrying tall loads
wheel
the rolling component typically pressed onto axle , mounted on rail car or locomotive truck or bogie. wheels cast or forged (wrought) , heat treated have specific hardness. new wheels trued specific profile before being pressed onto axle. wheel profiles need periodically monitored insure proper wheel rail interface. improperly trued wheels increase rolling resistance, reduce energy efficiency , may create unsafe operation. railroad wheel typically consists of 2 main parts: wheel itself, , tire around outside. railway tire steel, , typically heated , pressed onto wheel, remains firmly shrinks , cools.
wheel climb
the process of wheel climbing , off inside or gauge side of rail. major source of derailments. wheel climb more occur in curves wheels flanges worn or have improper angles. see rail adhesion.
wheel flange
the inner section of wheel rides between 2 rails. angle between wheel tread , flange specific rail prevent wheel climb , possible derailments. see rail adhesion. wheel flange part of wheel tire.
wheel-rail interface
the on-contact interaction between wheels , rails. term used in connection design , management of interaction.
wheel slip
the loss of traction due slippery rail or wheel. wheel slip common steam engines started move due excessive torque generated @ low speed. steam engines carried sand dispensing gear increase traction @ start of motion.
wheeltapper
a wheeltapper @ work on bulgarian railway
an historical railway occupation; people employed tap train wheels hammers , listen sound made determine integrity of wheel; cracked wheels, cracked bells, not sound same intact counterparts. job associated steam age, still operate in eastern european countries. modern planned maintenance procedures have obviated need wheel-tapper.
wheel tread
the conical section (often 1 in 20 slope) of railroad wheel primary contact point rail. see rail adhesion.
whistle
train whistles used safety warning , engineer communicate other railroad workers. see train whistle description of whistle code used communicate. nickname air horn on diesel locomotive. steam engine whistles historically known chimes in during 19th century.
whistle post
a double whistle post
an advance warning engineer of upcoming grade crossing. point @ engineer should begin sounding whistle or horn.
whyte notation
a system of describing steam locomotive wheel arrangements (e.g. 4-6-4, 2-10-2). first number indicates number of pilot wheels lead engine turns. second number of coupled wheels ( drivers ). third trailing idler wheels, provide support larger fireboxes. articulated locomotives described. example, union pacific big boy described 4-8-8-4, wherein pilot has 4 wheels, followed 2 sets of drivers, 8 wheels per set, , four-wheel trailing bogie under firebox. numbers include wheels on both sides of engine, 2-8-2 engine have 1 idler, 4 drivers, , final idler on each side of engine.
wigwag
a largely superseded level or grade crossing warning signal consisting of swinging disc facing road traffic red light in centre. disc hangs straight down, approaching train set swinging side side, red light illuminate or flash, , bell ring.
working water, foaming, or priming
the condition of steam locomotive drawing water through throttle valve, cylinders, , smokestack, causing damage cylinders or running gear
wrong-side failure
a failure in signalling system leaves system in dangerous condition
^ railroading glossary: w . trn.trains.com. kalmbach publishing. archived original on 30 august 2014. retrieved 20 february 2013.
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