TM 55-203
Journal box lubricator. A device for supplying oil to a
car journal bearing. This device takes the place of
train steampipe at the end of the car by which the
the ordinary form of waste packing.
steam supply may be cut off.
Journal brass. A solid type journal bearing.
Equalizer (passenger equipment trucks). A wrought-iron
or steel piece which bears on top of the journal
Knuckle (coupler). The rotating coupling hook by means
boxes and extends longitudinally from one to the
of which coupling is effected when the knuckle is
other.
locked by the catch or lock.
Knuckle pin (coupler). The pin holding the knuckle in
bar and carries part of the weight of a car. Single or
the jaws of the coupler.
double-coil spiral or helical springs are generally
used for this purpose.
Knuckle thrower. A device which throws the knuckle of
a car coupler open when the uncoupling rigging is
Express car. A car operated in passenger trains for
operated.
carrying express matter.
Often combined with
facilities for handling baggage or mail.
L1, L2, L3, and L4. (See Designations. )
Fascia. A plain board or plate running the length or
Lamp regulator. An electrical device which holds the
width of the car directly under the roof.
voltage of the utilization circuits of the car electrical
system constant during variations in the generator
voltage necessary for battery charging.
etc. , by which the piston rod of the brake cylinder
is connected to the brakeshoes in such a manner
Lateral motion. The motion which takes place crosswise
that, when air pressure forces the piston out, the
of the track.
brakeshoes are forced against the wheels.
Load limit (on rail). The combined light weight and load
weight of a car, which gives the maximum AAR axle
use of friction for absorbing and dissipating part of
loading.
the energy of buffing and tension shocks transmitted
Load limit (in car). That weight of load in a car which,
through the couplers.
when added to the light weight of the car, gives the
Geared brake. A handbrake which employs gear wheels
maximum AAR axle loading.
to increase braking force. Head-end system. A
Main reservoir (airbrake). A cylindrical tank carried on a
system of furnishing electric power for a complete
locomotive or a motorcar to hold a supply of
railway train from a single generating plant located
compressed air.
on the locomotive, on the tender, or on one of the
cars of the train.
Nailing strip. A strip of wood laid over a metal frame
and bolted to it to which the boards are nailed in a
Hotbox. An overheated journal caused by excessive
combined wood and steel car or an all-steel car.
friction between bearing and journal, lack of
lubricant, or foreign matter.
Non-pressure head (brake cylinder). The cover for the
end of the brake cylinder opposite to that having air
I-beam. A rolled-steel commercial bar whose cross
pressure against it. Packing cup. A packing of
section has the form of the letter I.
composition material which has largely replaced
Ice
bunker (refrigerator car). The receptacle or
leather for airbrake cylinders.
compartment in which the ice is placed in a
Packing ring (airbrake). A circular metallic ring of
refrigerator car.
variable rectangular cross section which is placed in
Journal. The part of an axle on which the journal
grooves in the edge of the piston to make it fit
bearing rests.
airtight in the cylinder.
Journal bearing. A combination of rollers and races or a
Pedestal (truck). In old designs of build-up trucks, a
block of metal, usually brass or bronze, in contact
casting in somewhat the form of an inverted U
with a journal on which the load rests.
bolted to the truck frame to hold the journal box in
place horizontally, but permitting a vertical
Journal bearing wedge. A device used to hold the
movement. In modern trucks, pedestals are cast
journal bearing in place, to distribute the load evenly
integrally with the truck frame.
over the bearing, and to allow it to be removed
easily. Journal box. The metal housing which
Piston. A metal disk with packing, etc. , made to fit in a
encloses the journal of a car axle and the journal
cylinder and transmit the power caused by the
bearing and wedge and which holds the oil and
pressure of a working fluid to the external
packing for lubricating the journal.
Glossary 4
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