RDC BuddCars DieselLocomotive SetOPERATOR’S MANUALCompatibilityThis engine will operate on anytraditional O-31 Gauge tracksystem, including M.T.H.’s RealTrax or ScaleTrax ortraditional tubular track. It is alsocompatible with most standard ACtransformers. (See page 15 for acomplete list of compatibletransformers and wiringinstructions.)PLEASE READ BEFORE USE AND SAVE

Table of ContentsSet Up Checklis t. 3Lubrication.3Basic Operation . 4Activating Features.4Loco-Sound Operating Instructions.6Activating Loco-Sound Features. 6Speed Control. 7Locking Locomotive Into A Direction. 7Using Proto-Cast and Proto-Dispatch Features. 8Maintenance. 9Lubricating and Greasing Instructions.9Cleaning The Wheels, Tires and Track.10Traction Tire Replacement Instructions.11Headlight Replacement Instructions. 12Troubleshooting Loco-Sound Problems. 13Transformer Compatibility and Wiring Chart. 15Service & Warranty Information. 16Limited One-Year Warranty. 16CAUTION: ELECTRICALLY OPERATED PRODUCT:Not recommended for children under 10 years of age. M.T.H. recommends adult supervision with children ages 10 - 16.As with all electric products, precautions should be observed during handling and use to reduce the risk of electric shock.WARNING: When using electrical products, basic safety precautions should be observed, including the followi ng:Read this manual thoroughly before using this device.M.T.H. recommends that all users and persons supervising use examine the hobby transformer and other electronic equipmentlperiodically for conditions that may result in the risk of fire, electric shock, or injury to persons, such as damage to the primarycord, plug blades, housing, output jacks or other parts. In the event such conditions exist, the train set should not be used untilproperly repaired.Donot operate your layout unattended. Obstructed accessories or stalled trains may overheat, resulting in damage to your layout.llThis train set is intended for indoor use. Do not use if water is present. Serious injury or fatality may result.lDo not operate the hobby transformer with damaged cord, plug, switches, buttons or case.

Set Up Checklist Lubricate the locomotiveApply power to run as described in the Basic Operating Section of this manualLubricationYou should lubricate the engine to prevent it from squeaking. Uselight household oil and follow the lubrication points marked “L” inFig. 1. Do not over-oil. Use only a drop or two on each pivot point.DO NOTOVER OILLubricate Pick Up Rollers (L)Lubricate Wheel Axles (L)Figure 1. Lubrication Points on the LocomotiveRailKing RDC Budd Cars3

Basic OperationThe Throttle knob controls how fast your train will travel.Turn the throttle knob up ½-way, until the engine and caboose lights shine bright.Put the engine into motion by pressing the Direction button on your transformer once.(hold it for approximately 1 second)If the engine does not begin to move as soon as you firmly press the Direction button,you may not have sent enough voltage to the track to make the train move. Turn thethrottle up a bit higher until the train begins to move.Activating FeaturesThrottle To increase or decrease track voltage, and therefore train speed, turn thethrottle control knob. Turning clockwise will increase voltage and speed, while turningcounterclockwise will decrease voltage and speed. The engine will maintain the speedyou set after you release the throttle until you turn it again to change the voltage andspeed.Bell - To sound the bell, in an engine equipped with a bell firmly press and release theBell button. To turn the bell off, press and release the Bell button again. The bell willcontinue to ring from the time you turn it on until you press and release the button againto turn it off.Horn/Whistle - To sound the whistle, firmly press the Horn/Whistle button. The whistlewill sound for as long as you continue to depress the button. It will stop when yourelease the button.Direction Your train is programmed tostart in neutral. The train will alwayscycle neutral-forward-neutral-reverse witheach press and release of the directionbutton. The engine is programmed torestart in neutral each time the trackvoltage is turned off for 25 seconds ormore.4Cycle PhasesNeutralReverseRailKing RDC Budd CarsForwardNeutral

Manual Volume ControlTo adjust the volume of all sounds made by this engine, turn the master volume controlknob located next to the fuel tank clockwise to increase the volume andcounter-clockwise to decrease the volume.Proto-Sound 2.0Volume Adjustment KnobFigure 2: Manual Loco-Sound Volume AdjustmentRailKing RDC Budd Cars5

Loco-SoundOperating InstructionsActivating Loco-Sound FeaturesLoco-Sound features are activated by sequences of Bell and Horn button pushesdescribed below. Please read the full descriptions of each feature before using it. To usethese buttons to activate features rather than to blow the horn or ring the bell, you shouldtap the buttons very quickly with a ½-second pause between button presses. You mayneed to practice your timing to make this work smoothly.Timing ChartPressHornShort &Firm½ Sec.PausePress½ Sec.PauseBellShort &FirmTotal Time Lapse: 1 ½ SecondsFeature to Be Activated:Speed Control On/OffLock into a Direction/Unlock6Button Code:1 Whistle, 2 Bells1 Whistle, 3 BellsRailKing RDC Budd CarsPressBellShort &Firm

Speed ControlM.T.H. engines equipped with Loco-Sound have speed control capabilities that allow theengine to maintain a constant speed up and down grades and around curves, much like anautomobile cruise control. You can add or drop cars on the run, and the engine willmaintain the speed you set.While the engine is programmed to start with the speed control feature activated, you canopt to turn it off. This means the engine's speed will fall as it labors up a hill and increaseas it travels downward. It is also affected by the addition or releasing of cars while on therun. Because the engine will run more slowly at a given throttle voltage when speedcontrol is on than when it is off, you should adjust the throttle to a lower power level foroperation with speed control off to avoid high-speed derailments. When speed control isoff, the volume will drop to allow for better low voltage operation.To turn speed control on and off, put the engine in neutral, then quickly tap thetransformer's Horn button one time then quickly tap the Bell button two times, allowingapproximately ½ second to lapse between each quick button press. Two horn blasts willindicate that the engine has made the change. Repeat the 1 horn, 2 bells code to return itto the other condition. You will want to do this during the initial neutral upon start-up ifyou ever couple this engine to another engine that is not equipped with speed control toavoid damaging the motors in either engine. Each time you shut down the enginecompletely, it will automatically turn speed control on.PlaceEngine intoNeutralHornBellBell Speed ControlTwo Horn BlastsRepeat to Returnto Normal ConditionLocking Locomotive Into A DirectionYou can lock your engine into a direction (forward, neutral, or reverse) so that it will notchange directions. To do this, put the engine into the direction you want (or into neutralto lock it into neutral), run it at a very slow crawl (as slowly as it will move withouthalting), and quickly but firmly tap the Horn button once followed by three quick taps ofthe Bell button, allowing approximately ½ second to lapse between each quick buttonpress. Two horn blasts will indicate that the engine has made the change. The engine willRailKing RDC Budd Cars7

not change direction (including going into neutral) until you repeat the 1 horn, 3 bellscode to return the engine to its normal condition, even if the engine is kept without powerfor extended periods of time.PlaceEngine intoDesiredDirectionHornHornBellBellBell Direction LockRepeat to Returnto Normal ConditionUsing Proto-Cast and Proto-Dispatch FeaturesWhen used with the RailKing Remote Lock-on (sold separately), Loco-Sound-equippedengines gain Proto-Cast and Proto-Dispatch features.Proto-Cast: This feature allows you to play audio recordings through your engine’sspeakers. You must supply the audio source (a small portable is sufficient) and amale-to-male mini cable (1/8” plug, like that used for the headset with a portable CD/tapeplayer) to connect your audio source to the remote lock-on. To use Proto-Cast, simplyplug the mini-cable into your audio source (usually into the headphone jack) and into the“Audio” port on the right side of the remote lock-on and adjust the volume.Proto-Dispatch: This feature allows you to broadcast your own voice through yourengine’s speakers. You must supply the microphone and a mini cable (1/8” plug, likethat used for the headset with a portable CD/tape player) to connect your microphone tothe remote lock-on. To use Proto-Dispatch, simply plug the mini-cable into themicrophone and into the “Mic” port on the left side of the remote lock-on and speak intothe microphone.When these features are in use, the locomotive’s own sounds (engine sounds and bells,whistles, and horns) will be muted so that only the sounds you broadcast will be heard.Because these two features are voice activated, there will be a 10-15 second delay afteryou stop speaking into the microphone or turn off the audio source before the enginesounds resume. To stop using the feature and return to normal operation, unplug the cablefrom the lock-on jack.If using parallel tracks with multiple Loco-Sound-equipped engines, Proto-Cast andProto-Dispatch transmissions from one track may be picked up by the other nearbyengines.If you experience popping and interference, try cleaning the track with denatured alcoholas described in the “Cleaning the Wheels, Tires and Track” section of this booklet.8RailKing RDC Budd Cars

MaintenanceLubricating and Greasing InstructionsThe engine should be well oiled and greased in order to run properly.Regularly lubricate all axles and linkage components and pickup rollersto prevent squeaking. Use light household oil, such as that found inM.T.H.'s maintenance kit. Do not over oil. Use only a drop or two oneach pivot point.DO NOTOVER OILBody Mount ScrewsBody Mount ScrewsGrease Idler Gear (G)Motor Mounting ScrewFigure 3The locomotive’s internal gearing was greased at the factory and should not needadditional grease until after 50 hours of operation or one year, whichever comes first.Follow the greasing instructions below. Note that in some tightly packed engines youmay need to move internal components temporarily in order to access the gears.1. To access the gear box, remove the cab from the chassis by unscrewing the chassisscrews as seen in Figure 3 and lifting the cab from the chassis.2. Once the cab is removed, remove the trucks by unscrewing the black Phillips motormount screw located on the underside of the drive trucks (see Fig. 4).3. Once the motor mount screw has been removed, pull the motor away from the truckblock and lightly coat the motor worm gear and bronze drive gear (in the truck block)with grease.4. Reassemble the truck and motor, being careful not to pinch any wires between thetruck block and motor mount.RailKing RDC Budd Cars9

5. After repeating the procedure for the other motor, reassmble the chassis and body,being careful that the wire harnesses are not caught between the chassis and body andreinstall the chassis screws.Motor Mount ScrewLubricate the outside truck blockidler and drive gears with grease.Use the diagram shown in Figure6 below as a guide and add greaseto the points marked with a “G.”Figure 4Cleaning The Wheels, Tires and TrackPeriodically check the locomotive wheels and pickups for dirt and buildup, which cancause poor electrical contact and traction as well as prematurely wear out the neoprenetraction tires.Periodically check the locomotivewheels and pickups for dirt andbuildup, which can cause poorelectrical contact and traction andprematurely wear out the neoprenetraction tires. Wheels and tires can becleaned using denatured (not rubbing)alcohol applied with a cotton swab.To clean the track, use RailKing TrackCleaning Fluid and a clean rag ordenatured (not rubbing) alcohol.Unplug the transformer and wipe therails of the track, turning the ragfrequently to ensure that you are usingclean cloth on the rails. Thereafter,keep an eye on the track and clean itwhen it gets dirty to ensure good electrical contact and to lengthen the life of the tires.10RailKing RDC Budd Cars

Traction Tire Replacement InstructionsYour locomotive is equipped with two neoprene rubber traction tires on each poweredtruck block. While these tires are extremely durable, you may need to replace them atsome point.First, remove the truck sides from the truck block. To do this, turn your engine upsidedown and remove the chassis as detailed on page 9.Remove the trucks from the chassis and the truck sides from the trucks in order to slip thenew tire over the grooved drive wheel.Once the truck sides have been removed:1. Make sure the old tire has been completely removed from the groove in the drivewheel, using a razor blade or small flathead screwdriver to pry away any remains.2. Slip the new tire onto the wheel. You may find it useful to use two small flatheadscrewdrivers to stretch the tire over the wheel.3. If you twist the tire while stretching it over the wheel, you will need to remove andreinstall the tire. Otherwise your engine will wobble while operating.4. Make sure the tire is fully seated inside the groove. Use a razor blade to trim away anyexcess tire that will not seat inside the groove properly.5. Reassemble in the reverse order.Replacement parts and wick replacement instructions are available directly from theM.T.H. Parts Department (order online:, e-mail:[email protected]; mail: 7020 Columbia Gateway Drive, Columbia MD21046-1532, FAX: 410-381-6122).RailKing RDC Budd Cars11

Headlight Replacement InstructionsThe locomotive’s headlight is controlled by a constant voltage circuit in the engine. Theheadlight is easy to remove and replace when it burns out. The bulb has a quickdisconnect plug that attaches the bulb harness to a light circuit. Replacement bulbs areavailable directly from the M.T.H. Parts Department.Follow the body removal instructions found in the Lubrication and Greasing Instructions.Gently disconnect the bulb harness from the socket on the constant voltage circuit andreplace the bulb.HeadlightWire HarnessFigure 512RailKing RDC Budd Cars

Troubleshooting Loco-Sound ProblemsAlthough Loco-Sound has been designed and engineered for ease of use, you may havesome questions during initial operation. The following table should answer mostquestions. If your problem cannot be resolved with this table, contact M.T.H. forassistance (telephone: 410-381-2580; fax: 410-423-0009; [email protected],7020 Columbia Gateway Drive, Columbia MD 21046-1532).Starting UpRemedyWhen I first turn the power on, theengine will not begin to run. I have toturn the throttle off and then on againto get the engine to operate.This is normal behavior. To preventaccidental high-speed start-ups, LocoSound is programmed to start up inneutral anytime track power has beenturned off for several seconds. Seethe "Basic Operation" section for moredetails.HornRemedyI can’t get the horn to blow when Ipress the whistle button.You may be pressing the button tooquickly. Try pressing the whistle buttonmore slowly, taking approximately oneRemedyfullsecond to fully depress the button.BellRemedyI can’t get the bell to ring when I press You may be pressing the button tooquickly. Try pressing the bell buttonthe bell button.more slowly, taking approximately onefull second to fully depress the button.Lock-outRemedyI can’t get the engine to run after Ipower up the transformer. It sits stillwith the engine sounds running.The engine is locked into the neutralposition. Follow the procedure in the“Lock into a Direction” section.The engine won’t lock into forward,neutral, or reverse.Engine speed must be below 10 scalemph (approx. 10 volts or less inconventional mode).RailKing RDC Budd Cars13

VolumeRemedyThe sounds seem distorted, especially Loco-Sound volume is set too high.Turn the volume control knob on thewhen the whistle or bell is activated.bottom of the chassis counterclockwise to reduce the volume.14RailKing RDC Budd Cars

Transformer Compatibility and Wiring ChartLoco-Sound is designed to work with most standard AC transformers. The chart belowlists the many compatible transformers. Note that many of the operational commandsdescribed in these instructions require a bell button, so if your transformer does not haveits own bell button, you should consider adding one to get the full benefit of the system.In addition, the chart details how the terminals on these transformers should be attachedto your layout.TransformerModelCenter RailOutside RailMin/Max.VoltagePowerRatingTransformerTypeMTH Z-500Red TerminalBlack Terminal0-18v50-WattElectronicMTH Z-750Red TerminalBlack Terminal0-21v75-WattElectronicMTH Z-4000Red TerminalBlack Terminal0-22v390-WattElectronicLionel 1032UA5-16v90-WattStandardLionel 1032MUA5-16v90-WattStandardLionel 1033UA5-16v90-WattStandardLionel 1043UA5-16v90-WattStandardLionel 1043MUA5-16v90-WattStandardLionel 1044UA5-16v90-WattStandardLionel 1053UA8-17v60-WattStandardLionel 1063UA8-17v60-WattStandardAll-TrolLeft TerminalRight Terminal0-24v300-WattElectronicDallee HostlerLeft TerminalRight TerminalLionel LWAU8-18v75-WattStandardLionel KWA or BU6-20v190-WattStandardLionel MWOutside TrackTerminalInside TrackTerminal5-16v50V.A.ElectronicLi onel RS-1Red TerminalBlack Terminal0-18v50V.A.ElectronicLionel RWUA9-19v110-WattStandardLionel SWUAUnknown130-WattStandardLionel TWUA8-18v175-WattStandardLionel ZWA,B,C or DU8-20v275-WattStandardLionel Post-WarCelebrationSeries ZWA,B,C or DCommon0-20v135/190 WattElectronicElectronic* Conventional Mode OnlyRailKing RDC Budd Cars15

Service & Warranty InformationHow to Get Service Under the Terms of the Limited One-Year WarrantyFor warranty repair, follow the instructions below to obtain warranty service.First, e-mail, write, call or fax an Authorized M.T.H. Service Center in your area or M.T.H. Electric Trains toobtain Repair Authorization. You can find the list of Authorized Service Centers on the M.T.H. web site, Authorized Service Centers are required only to make warranty repairs on ite ms sold fromthat store; all other repairs may or may not be done at the store’s own discretion. Otherwise, con tact M.T.H. (fillout the Service Contact form in the Service Section of; send US mail to the address listedbelow; tel: 410-381-2580; fax: 410-423-0009), stating when the item was purchased and describing the problem.If you contact M.T.H., you will be given a return authorization number to assure that your merchandise will beproperly handled upon its receipt.CAUTION: Make sure the product is packed in its original factory packaging including its foam and plasticwrapping material so as to prevent damage to the merchandise. The shipment must be prepaid and we recommendthat it be insured. A cover letter including your name, address, daytime phone number, e-mail address (ifavailable), Return Authorization number, a copy of your sales receipt and a full description of the problem mustbe included to facilitate the repairs. Please include the description regardless of whether you discussed theproblem with a service technician when contacting the Service Center or M.T.H. for your Return Authorization.Limited One-Year WarrantyAll M.T.H. products purchased from an Authorized M.T.H. Train Merchant are covered by this warranty.See our website at or call 1-888-640-3700 to identify an Authorized M.T.H. Train Merchant near you.M.T.H. products are warrantied for one year from the date of purchase against defects in material or workmanship,excluding wear items such as light bulbs, pick-up rollers, batteries, smoke unit wicks, and tractio n tires. We willrepair or replace (at our option) the defective part without charge for the parts or labor, if the item is returned to anAuthorized M.T.H. Service Center or M.T.H. Electric Trains within one year of the original date of purchase. Thiswarranty does not cover damages caused by improper care, handling, or use. Transportation costs incurred by thecustomer are not covered under this warranty.Items sent for repair must be accompanied by a return authorization number, a description of the problem, and acopy of the original sales receipt from an Authorized M.T.H. Train Merchant, which gives the date of purchase. Ifyou are sending the item to M.T.H., fill out the Service Contact form in the Service Section; send US mail to the address listed below; call 410-381-2580, or fax 410-423-0009 toobtain a return authorization number. If you are sending this product to an Authorized Service Center, contact thatCenter for their return authorization.This warranty gives you specific legal rights, and you may have other rights that vary from state to state.Service DepartmentM.T.H. Electric Trains7020 Columbia Gateway DriveColumbia MD 21046-1532


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RailKing RDC Budd Cars 11 , Your locomotive is equipped with two neoprene rubber traction tires on each powered truck block. While these tires are extremely durable, you may need to replace them at some point. First, remove the truck sides from the truck block. To do this, turn your engine upside down and remove the chassis as detailed on page 9.