Select the system
Define the track system, protocol and command station.
The comprehensive guide hub for digital model railway operation
Digital Model Railways: Basics, Command Stations & Decoders
From the first digital command station to a fully automated large layout: discover the basics, protocols, Wi-Fi control, command stations, decoders, interfaces, sound, feedback, boosters and systematic assistance with common vehicle problems.
58 linked specialist topics
H0, TT, N, Z, 0, 1 and G
From beginner knowledge to fault diagnosis
Drive, switch, detect and automate
What is included in a digital model railway?
A digital command station transmits power and control commands through the track. Locomotive decoders recognise their addresses and control the motor, lighting, sound and other functions. Accessory decoders operate turnouts and signals, feedback modules detect occupied track sections, and boosters provide additional power for larger layout districts.
A small digital layout can be operated entirely by hand. Smartphones, Wi-Fi, feedback, routes and computer control are added only when greater convenience or automation is required. Digital technology can therefore grow gradually with the project.
Compatibility is decisive. The command station and decoder need a common protocol. Feedback modules, boosters and handheld controllers must use a compatible digital bus. Vehicle decoders also require the correct interface, adequate motor capacity and suitable function outputs.
Practical advice
Build the digital system step by step
Begin with a command station, one reliably operating digital locomotive and a straightforward test circuit. Add accessory modules, feedback, boosters and automation only after the basic operation is stable.
Five routes through the guide hub
Where should you begin with digital technology?
01
Understand the basics
Distinguish between the command station, decoder, booster, feedback and digital bus.
Open the basics → 02Choose the digital language
Understand DCC, mfx, Motorola, Selectrix and RailCom.
Compare protocols → 03Select a command station
Compare beginner, large-layout and smartphone-controlled systems.
Explore command stations → 04Digitise vehicles
Understand decoders, interfaces, sound and programming.
Open the decoder guide → 05Expand the layout
Switch accessories, add feedback, distribute power and automate operation.
Plan the layout expansion →
Go directly to the correct detailed page
Which digital topic do you need to resolve?
Depending on your task, the topic finder links to the basics, command-station comparison, decoder guide or troubleshooting page.
When a vehicle connection is unknown, begin with the interface comparison. For a large layout, estimate the total current before planning boosters and power districts.
If a decoder becomes very hot or produces an unusual smell, electrical safety takes priority. Switch off the track voltage before opening the appropriate troubleshooting guide.
Digital Model Railway Topic Finder
Select your current task.
Digital model railways explained simply
Understand command stations, decoders, accessory control, feedback and power.
Open guide
From the operating command to the feedback bus
Digital model railway basics
Complete introduction
Digital model railways explained simply
System structure, operation and initial purchasing decisions.
Open the basics → Control centreHow does a digital command station work?
Understand commands, the track signal, addresses and connections.
Understand command stations → VehicleWhat is a locomotive decoder?
Control the motor and vehicle functions digitally.
Explain locomotive decoders → Functions without a motorWhat is a function decoder?
Switch lighting and auxiliary functions in coaches.
Explain function decoders → Layout accessoriesWhat is an accessory decoder?
Operate turnouts, signals and electrical loads digitally.
Explain accessory decoders → DetectionWhat is a feedback module?
Report occupied tracks and contact states to the control system.
Explain feedback → PowerWhat is a booster?
Supply additional power and separate short-circuit districts.
Explain boosters → System connectionWhat is a digital bus?
Understand LocoNet, s88N, XpressNet, R-Bus and CAN.
Explain digital buses →
Digital languages and networks
Protocols, feedback and mobile control
Complete comparison
Digital protocols compared
Compare DCC, mfx, Motorola and Selectrix.
Compare protocols → Open standardDCC explained simply
Addresses, speed steps, CVs and accessory commands.
Open DCC guide → Automatic registrationmfx explained simply
Register and manage compatible Märklin locomotives conveniently.
Open mfx guide → Existing layoutsMotorola explained simply
Understand older Märklin digital technology correctly.
Open Motorola guide → Compact systemSelectrix explained simply
Driving, switching and feedback on existing layouts.
Open Selectrix guide → Bidirectional communicationRailCom explained
Receive decoder information through compatible DCC systems.
Open RailCom guide → NetworkingWi-Fi and LAN for digital command stations
Connect the router, app, computer and command station.
Open network guide → Mobile controlControl a model railway with a smartphone or tablet
Compare apps, Wi-Fi controllers and operating concepts.
Open smartphone guide →
From compact beginner controllers to comprehensive system command stations
Select command stations and compare manufacturer systems
Selection by layout size
Command-station overviews and buying decisions
Complete comparison
Digital command stations compared
Compare protocols, power, operation and system buses.
Open comparison → Decision supportWhich digital command station is right for me?
Select a system according to the requirements of your layout.
Open selection guide → Compact startDigital command stations for beginners
Straightforward operation and practical expandability.
Open beginner systems → More powerDigital command stations for large layouts
Plan boosters, buses, feedback and automation.
Open large-layout systems → App controlDigital command stations with smartphone control
Compare Wi-Fi, apps and mobile handheld controllers.
Open smartphone systems → All systemsDigital command stations: overview and selection
Compare brands, functions and intended user groups.
Open command-station overview →
Manufacturer-specific system guides
Command stations and digital systems by brand
Märklin
Märklin Central Station
CS3, mfx, routes and Märklin system buses.
Open Märklin system → RocoRoco Z21 and z21
Wi-Fi, apps, multiMAUS and R-Bus.
Open Z21 system → PIKOPIKO SmartControl
Connect Wi-Fi handheld controllers, boosters and SmartDecoders.
Open PIKO system → ESUESU ECoS
Combine ECoS, ECoSlink, LokPilot and LokSound.
Open ESU product range → UhlenbrockUhlenbrock Intellibox
LocoNet, multi-protocol operation and modular control.
Open Intellibox guide → LenzLenz Digital Plus
DCC, XpressNet, ABC and RailCom.
Open Lenz system → ZIMOZIMO systems
Command stations, handheld controllers, decoders and sound technology.
Open ZIMO system → MassothMassoth for garden railways
DiMAX, wireless control and high-output G-gauge technology.
Open Massoth guide → Specialist DCC systemsDigitrax and other systems
Understand LocoNet and international DCC solutions.
Open DCC system guide →
Vehicle technology from selection to fault diagnosis
The complete decoder guide
Decoder types and interfaces
Select the correct decoder
Main overview
Model railway decoder guide
Understand locomotive, sound, function and accessory decoders.
Open decoder guide → Motor controlChoose a locomotive decoder
Compare the motor current, protocol and outputs.
Open locomotive-decoder guide → Driving and soundChoose a sound decoder
Match the project, loudspeaker and decoder dimensions.
Open sound-decoder guide → Coach functionsChoose a function decoder
Switch lighting and auxiliary functions without a motor.
Open function-decoder guide → Complete comparisonCompare decoder interfaces
Identify the contact count, standard and range of functions.
Open interface comparison → Classic H0 plugEight-pin interface
Check the orientation and pin assignment correctly.
Open eight-pin guide → CompactSix-pin interface
Understand direct plugs for N and TT vehicles.
Open six-pin guide → NEM 658PluX16
Compact PluX connection for vehicle decoders.
Open PluX16 guide → Numerous functionsPluX22
Connect the motor, lighting, sound and auxiliary functions.
Open PluX22 guide → NEM 662Next18
Understand the compact, keyed decoder interface.
Open Next18 guide → MTC circuit board21MTC
Distinguish between logic-level and amplified outputs.
Open 21MTC guide → StandardNEM 651
Understand the six-pin standard assignment in detail.
Open NEM 651 guide → StandardNEM 652
Assign the eight-pin motor and lighting connections.
Open NEM 652 guide → Expansion modulesSUSI
Connect sound and expansion modules digitally.
Open SUSI guide →
Installation and programming
Retrofit and configure decoders safely
Sound quality
Choose the correct loudspeaker
Match the impedance, power rating and sound enclosure.
Open loudspeaker guide → ConversionInstall a decoder
Connect the motor, track pickups and lighting safely.
Open installation guide → CV basicsProgram a decoder
Read, write and document decoder values.
Open programming guide → Factory settingsReset a decoder
Carry out a manufacturer-specific reset safely.
Open reset guide → AddressingChange a locomotive address
Manage short, long and automatically assigned addresses.
Open address guide → Driving dynamicsSet acceleration and braking delay
Adjust acceleration and braking time realistically.
Open delay guide → Slow-speed operationOptimise motor control
Improve jerking, load changes and motor profiles.
Open motor-control guide → AUX outputsConfigure lighting outputs
Set dimming, LEDs and lighting patterns.
Open lighting guide → Button assignmentFunction mapping
Assign buttons, AUX outputs and sound slots freely.
Open mapping guide → Sound memoryLoad sound projects
Transfer and save manufacturer-specific projects safely.
Open sound-project guide → Stay aliveConnect buffer storage
Check the charging circuit, polarity and bridging time.
Open buffer-storage guide →
Manufacturer-specific troubleshooting
Investigate common decoder faults systematically
Overload
Decoder overheating
Check the motor current, short circuits and outputs.
Resolve overheating → No responseDecoder not responding
Check the power, address, protocol and programming locks.
Open diagnostic guide → Direction of travelLocomotive runs the wrong way after installation
Correct CV 29, motor wires and lighting.
Correct the direction →
From a test circuit to an automated layout
Expand a digital model railway in six stages
Configure the vehicles
Check the decoder, address, lighting and driving behaviour.
Operate accessories
Digitise turnouts, signals and layout lighting.
Add feedback
Detect contacts and track occupancy reliably.
Distribute the power
Separate booster and short-circuit districts correctly.
Automate operation
Integrate routes, block operation and control software.
| Gauge | Typical protocols | Common interfaces | Special requirements |
|---|---|---|---|
| Z and N | Primarily DCC | Next18, NEM 651 and micro decoders | Very limited space and restricted heat dissipation |
| TT | DCC and multi-protocol | Next18, PluX12 and PluX16 | Check compact decoders and vehicle circuit boards |
| H0 two-rail | DCC, RailCom and multi-protocol | PluX22, 21MTC, NEM 652 and Next18 | Wide selection of command stations and decoders |
| H0 centre-conductor | mfx, Motorola and DCC | 21MTC, PluX22 and OEM circuit boards | Consider the pickup shoe and vehicle design |
| 0 and 1 | DCC and multi-protocol | Large-scale decoders and screw terminals | Higher motor and function currents |
| G and IIm | DCC and garden-railway systems | Large-scale circuit boards and wired connections | Outdoor operation, long wiring runs and high power |
System command stations, decoders and layout modules
Important digital model railway manufacturers
Suitable digital equipment at Modellbahnshop
Command stations, modules, programmers and decoders
Check the protocol, digital bus, output power, interface, motor current and installation dimensions before making a selection.
Driving and operation
Digital command stations and handheld controllers
Multi-Protocol
ESU 50220 ECoS 2.5
Touchscreen command station for comprehensive digital systems.
View product
LocoNet
Uhlenbrock 65300 Intellibox 3
Multi-protocol command station with the LocoNet system bus.
View product
Wi-Fi
Roco 10834 Z21 Profi
Network-enabled DCC system with Wi-Fi operation.
View product
mfx
Märklin 60226 Central Station 3
Comprehensive command station for mfx, DCC and Märklin layouts.
View product
DCC
Lenz 20200 LZV200
DCC command station with an integrated power amplifier.
View product
Gauge G
PIKO 35055 SmartControl Wi-Fi
Wireless digital system for garden railways.
View product
Beginner
Märklin 60657 Mobile Station
Compact handheld controller for Märklin digital operation.
View product
Wi-Fi Controller
Uhlenbrock 64360 DAISY II Wi-Fi
Wireless DCC set for compact layouts.
View product
Switching, detecting and boosting
Digital modules for all gauges
Switching
PIKO 55032 SD 2000
Accessory decoder for turnouts and solenoid accessories.
View product
Feedback
YaMoRC YD6016ES-CS
Sixteen-channel feedback module for compatible s88N systems.
View product
Accessories
ESU 51831 SwitchPilot 3 Plus
Eight-output accessory decoder with OLED configuration.
View product
Booster
Roco 10805 Z21 Booster
Additional power for a separate Z21 supply district.
View product
Occupancy Detection
Roco 10819 Z21 Detector X16
Track-occupancy detector for the R-Bus system.
View product
Programming and vehicle functions
Programmers and decoders for H0 gauge
Programmer
ESU 53451 LokProgrammer
Edit ESU decoders and sound projects.
View product
Programmer
PIKO 56415 SmartProgrammer
Configure SmartDecoders and transfer sound.
View product
Diagnostics
Uhlenbrock 71000 DigiTest
Test decoders and interfaces outside the locomotive.
View product
H0 PluX22
PIKO 56500 SmartDecoder XP 5.1
Multi-protocol decoder with a PluX22 interface.
View product
H0 21MTC
ESU 59619 LokPilot 5
Multi-protocol decoder for 21MTC vehicle circuit boards.
View product
Function Decoder
ESU 59210 LokPilot 5 Fx
Lighting and auxiliary functions without a motor output.
View product
Compact to large scale
Decoders for TT, N, Z, 0, 1 and G
TT / N
ESU 59818 LokPilot 5 micro
Compact multi-protocol decoder with Next18.
View product
TT
Tillig 66035 PluX12
Vehicle decoder for compatible TT locomotives.
View product
N / TT
ZIMO MN150N
Very small decoder with a direct NEM 651 plug.
View product
0 / 1 / G
ESU 58513 LokSound 5 XL
High-output sound decoder for large vehicles.
View product
Gauge G
PIKO 36505 SmartDecoder XP 5.1 S
Blank large-scale sound decoder.
View product
Frequently asked questions about digital model railways
Answers about command stations, decoders and layout expansion
What is the minimum equipment required for a digital model railway?
You need a digital command station with a power supply, a handheld controller or other user interface, track and at least one locomotive with a compatible decoder.
Can several locomotives operate on the same track?
Yes. Each locomotive has its own decoder address and responds only to the driving and function commands intended for it.
Is DCC suitable only for two-rail layouts?
No. DCC is a digital protocol rather than a track-power system. It is frequently used on two-rail layouts but can also be used with compatible centre-conductor systems.
What is the difference between mfx and DCC?
DCC is a widely used cross-manufacturer standard. mfx is closely associated with Märklin and supports automatic registration with compatible equipment.
When is a booster required?
A booster is required when the current demand exceeds the command station's output or when the layout must be divided into separate supply and short-circuit districts.
What is the difference between an accessory decoder and a feedback module?
An accessory decoder executes a command. A feedback module detects a state and returns that information to the control system.
Can a model railway be controlled with a smartphone or tablet?
Yes, when the command station provides a compatible network or Wi-Fi connection and a suitable app or web interface.
Can digital equipment from different manufacturers be combined?
Frequently, yes, provided that the protocol, digital bus, electrical specifications and interfaces are explicitly compatible.
Is a digital model railway automatically computer-controlled?
No. Digital operation can remain entirely manual. Automatic routes require feedback, compatible modules and control software.
Which decoder fits my locomotive?
The interface, installation space, motor current, protocol and required function outputs are decisive. A sound decoder also requires a compatible loudspeaker connection.
A digital model railway grows through knowledge and clear system planning
Further guides covering gauges, power systems, layout planning, maintenance and prototypes are available in the central model railway guide.