Local network control
Connect through the Z21 LAN interface without routing train commands through a cloud service.
Roco/Fleischmann Z21 control app
A modern Z21 app
for desktop and mobile.
Connect LocoLink to your Z21 over the local network. Drive locomotives, switch accessories, build a track plan, program DCC decoders and grow into feedback-based automation.
Z21 works nowLocal LAN connectionNo extra LocoLink hardware
Z21 + LocoLinkThe Z21 remains the digital command station; LocoLink becomes the control surface.
Windows + ApplePlatforms
30 daysPro trial
NonePayment today
Z21 · ECoS · DCC-EXCore systems
Z21 workflow
Use the open network connection for more than driving
The Z21 family provides a strong base for app control. LocoLink adds a consistent project across Windows and Apple devices.
Locomotive throttle
Control speed, direction, emergency stop and decoder functions with a modern UI.
Track plan and routes
Operate turnouts and signals in the context of your complete layout.
DCC programming
Use supported Z21 programming workflows for CV reading, writing and speed tables.
Feedback and blocks
Bring supported feedback data into block control and automatic operation.
Project and import tools
Use structured project checks and supported Z21 data workflows when building the LocoLink project.
Setup
Connect LocoLink to Z21
Use the official Z21 network setup as the base and validate one locomotive before adding the complete layout.
Join the same network
Connect the device running LocoLink to the LAN or Wi-Fi network that contains the Z21.
Select the Z21 profile
Let the app find the station or enter the local address, then confirm that communication is stable.
Test and expand
Try stop, direction and one accessory before importing data or enabling automation.
Z21 family
Z21 details that affect app control
The product name on the box is not the only detail that matters.
| Item | What it means | Action |
|---|---|---|
| Black Z21 / Z21 XL | Network control is part of the platform | Connect on the same LAN and verify firmware |
| White z21 | Network app control is a core use case | Use the supported router/LAN configuration |
| z21 start | LAN control may be locked in a starter set | Check whether the official Z21 unlock package has been activated |
| Firmware | Protocol behaviour can improve over time | Update through official Z21 tools when appropriate and retest |
| Feedback hardware | Bus and module choice determines available events | Validate every sensor address before automation |
Compatibility reviewed 18 July 2026. The official Z21 documentation is the authority for hardware activation and firmware. LocoLink publishes its own integration status in the command-station adviser.
Choosing a Z21 app
Official Z21 app or an alternative control environment?
The official Z21 app is the natural starting point for many Z21 owners and remains useful for supported Z21 workflows. LocoLink is an alternative for operators who want the same layout-oriented control environment on Windows, Mac, iPhone and iPad, with guided decoder, project and automation tools.
An alternative app does not change the electrical role of the Z21. The command station still talks to the decoders and provides the digital system. LocoLink connects through the documented local-network interface and adds its own project model and user experience.
Test before changing an exhibition or club layout
Keep the existing Z21 setup available, back up relevant projects and validate LocoLink on one route. Confirm that addresses, functions, accessory formats and feedback events match before enabling automatic operation.
If you own a z21 start, first verify the official LAN unlock status. An app cannot work around a command station that has not enabled third-party LAN control.
FAQ
Frequently asked questions
Does LocoLink work with Roco/Fleischmann Z21?
Yes. Z21 is listed as a works-now integration over the local network.
Does a z21 start need an unlock code?
Some z21 start units supplied in starter sets require the official Z21 LAN unlock package before third-party app control is enabled.
Does LocoLink replace the official Z21 app?
It is an alternative control environment, not a requirement. You can evaluate both and choose the workflow that suits your layout.
Can LocoLink program decoders through Z21?
Supported Z21 programming workflows are available. Always use the correct programming track or POM setup and test with the exact firmware.
Can I automate a Z21 layout with LocoLink?
Yes, when feedback, blocks, routes and stopping behaviour are correctly configured and validated.