Automatic Reversing Circuit - Mk IV
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Reversing loop wiring
Reversing Loops
Track sections that double back on itself (trains reverse direction while running) are called reversing loops and require special wiring.
Reversing Track:
You may need a runaround track to keep your engine or train from being blocked in on a branch line, and to allow drop-offs without tying up the mainline.
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Reversing Lever
A lever inside the cab of a steam locomotive which actuates the reversing of the valve-gear.
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Reversing the Locomotive
Lionel locomotives can be stopped and reversed by remote control. The reversing mechanism is known as the "E-Unit." It is mounted within the locomotive and is operated by momentary interruptions of current to the track.
Reversing
A station where train reverses direction of travel . May be at normal dead end or terminal station.
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Automatic reversing
A circuit that senses short circuits and reverses the polarity. Used commonly with reversing loops, wyes, and turntables.
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The manual reversing lever on a steam locomotive (usually an older locomotive).
Journal
The load-bearing part of a railroad car axle. The weight of the axle is carried by the journal bearing, enclosed in the journal box.
I have trouble with my locos reversing properly. A sequencer is the device that controls locomotive direction. The "E-Unit" was originally developed by Ives. It was a trademarked name I believe, where the generic name for the device is a sequencer.
Used on reversing loops and triangular junctions.
Dropper Wire : Feed wires soldered to the side or base of the rail and which then pass beneath the baseboard.
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.
Dog bone - Model railroad arrangement consisting of two reversing loops connected together. Also known as" Dumb Bell".
Double - To take a train up a hill one half at a time.
Double-header - A train pulled by two locomotives.
Dynamic Braking is basically the reversing of polarity between the traction motors and main generator. Under throttle or motoring, the main generator converts mechanical force of the prime mover (diesel engine) into electrical energy.
They would back up into the tunnel, bumping the caboose a little bit more up the hill into the tunnel before reversing directions (The top of the hill was near the north end of the tunnel so they had to be carefull not to push too far!).
My first thought was to provide a variable power supply and reversing switch for the turntable drive. STOP! Our locomotive throttles were designed to provide smooth and reliable control of little motors.
A popular style of trackplan is a single mainline with a reversing loop at both ends. Reversing loops can also be embedded in oval track plans.
This also vastly simplifies wiring of reversing sections. You can use off-the-shelf reversing section control circuits for command control while still having complete block detection of the reversing section.
Out & Back may require a reversing loop but allows the train to make a journey to a location and then a return from that location.
E-Unit
An electrically-activated mechanical reversing device on some model locomotives, especially those made prior to 1990. Most recent model locomotives are equipped with solid-state electronic reversing units.
Direction is controlled by reversing the DC supply. Locomotives are stopped by removing the voltage from the track. This system in its simplest form can only control one locomotive at a time.
A full-wave rectifier converts the whole of the input waveform to one of constant polarity (positive or negative) at its output by reversing the negative (or positive) portions of the alternating current waveform.
Current-DC--Direct Current. Most scale and hirail equipment operates on direct current offering smooth operation. By reversing a switch on the control panel a DC engine will reverse instantly.
The lever which controls the direction of motion of the locomotive by reversing the traction motor field connections.
Reverse Movement
A movement opposite the authorized direction.
HORSE 'ER OVER"Reverse the engine. This is done by compressed air on modern locomotives, but in early days, manually operated reversing equipment required considerable jockeying to reverse an engine while in motion ...
com on several occasions in December 2004 and January 2005 it failed, so perhaps this organisation has ceased operation.
Wye
RAILWAYS. Y-junction, often used for reversing and therefore sometimes called a reversing Y. Also called a triangle.
You'll notice that we're using the DC terminals. Some believe that the lights won't last as long with DC as with AC. What you can do to prolong the life is to switch the polarity from time to time using the reversing switch.
An elongated oval or lap with the tracks at the sides pressed together somewhat in the manner of a double-track. Model railroad arrangement consisting of two reversing loops connected together. Also known as" Dumb Bell".
Around 1900, in response to competition from European toy makers, Ives produced colorful electric locomotives with the first automatic reversing units. Heightened competition from Lionel and American Flyer led to Ives declaring bankruptcy in 1928.
Triangle Additional track laid at a major junction to allow trains to be turned by running the three sides of the triangle rather than reversing in a wye.
 See also: Track, Train, Switch, Locomotive, Point
  
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