Power Unit
A device which converts high-voltage main current into low voltage currents, often with several outputs.
Powered Frog ...
A power unit with traction motors but no prime mover or generator; electricity for the motors is supplied by a connected locomotive.
Road unit ...
Beyer-Garratt An articulated steam locomotive with a central boiler/cab assembly pivoted between two power units. Designed for hard roads with tight curves, this type is found mostly in Africa.
Capstan Used with ropes for moving vehicles in restricted areas like workshops, where a locomotive or other power unit cannot be accommodated. Most common where ground mounted wheel lathes are used.
" Almost identical to the power unit of the 9900, it varied only by inches in it dimensions and incorporated the cosmetic changes and operating improvements already in place on the Twins.
Failure of the motive power unit does not require taking the entire train out of service.
Maximum utilization of power cars: idle trains waste costly motive power resources.
Now think about your power unit, or transformer. The wire that is connected to the positive terminal of the power unit will carry the electrons from the power pack to one rail of the track making that rail the positive side of your track throughout ...
They have a spring which keeps the switch rails firmly in the selected position and an under-table power unit which is easy to install (although you have to cut a hole in the table).
Locomotives that are not loading the full amount of amperage under specific circumstances also waste fuel. A 3000 horsepower unit that is only producing 2600 or 2700 horsepower as a result of the loading problem is also wasting fuel.
The driver location, can be single ended or double ended. Not always located in the same vehicle as the power unit! (see DVT)
Cab Control
Capacitor ...
The crew member whose job it is to keep the fire and steam up in a steam locomotive, and who is responsible for the operating condition of power units on diesel and electric engines.
Fish Plate
A bar which joins the ends of rails.
(After all, we say we are modelers.) Certainly a train with one power unit and three to five cars looks better than a faithful model of a name train when we run it on a small layout.
 See also: Locomotive, Track, Diesel, Engine, Switch
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