JMRI 4.14 is recommended for new users. It's the most recent stable production release.
For more information, please read the JMRI 4.14 Release Note, which also contains the download links.
JMRI 3.10.1 is recommended for JMRI users with computers that can only run Java 1.6; later releases require Java 1.8.
For more information, please read the JMRI 3.10.1 Release Note, which also contains the download links.
JMRI 2.14.1 is recommended for JMRI users with computers that can only run Java 1.5; later releases require Java 1.6/1.8.
For more information, please read the JMRI 2.14.1 Release Note, which also contains the download links.
This is the next in a series working toward the next JMRI production release 4.16 in early Summer 2019.
For more information on this test release, please read the JMRI 4.15.6 Release Note, which also contains the download links.Release 4.14 is the current "production" release, recommended for first-time users.
Train Throttle Windows App
Train Throttle Windows App works with JMRI
to let you run a train from a Windows computer.
You can download it from the Microsoft store.
DigiTrains Android App for running trains from JMRI
- The DigiTrains Android app now works with JMRI to provide user-friendly locomotive, accessory and route control from Android phones and tablets.
AnyRail can now export your layout design to JMRI!
The AnyRail layout planning software can now export a layout design as a JMRI panel file that can be imported to Layout Editor.
For the details, see the AnyRail documentation.
JMRI now supports MRC/GaugeMaster DCC systems!
You can connect JMRI to MRC/Gaugemaster hardware by just setting the JMRI preferences and wiring it up.
For the details, see our MRC page.
Several users have contributed their clinics for our
Clinics page. There are both conventional handout
and slides clinics, and also some neat interactive clinics for DecoderPro®
Some JMRI clinics from past NMRA national and other conventions are also included.
You can now use your iPhone, iPod Touch or Android cell phone as a throttle with JMRI.
After you download and install a program onto your phone, you can connect it wirelessly to your computer running JMRI, which in turn will run your layout. Imagine friends visiting your layout and running trains from their cellphones, without having to bring throttles.
For more information, please see the feature page.
- Now, you can control your layout directly from your computer, smartphone or tablet, without the need to download and install any application. The current web browsers running on these devices are able to manage the resources and features needed to replace physical throttles. Just start the JMRI Web Server on your JMRI computer, open http://<your JMRI server>/web/webThrottle.html and enjoy it. For more information, please visit the webThrottle - Web control for locos, panels, turnouts and routes page.
- The JMRI applications have a built-in help system. It has lots of information, including overviews and window-specific information. The pages are simple HTML, and users are encouraged to add missing information. The Help information is available online via either the Index or Table of Contents.
- The Crandic Automated Traffic System (CATS) is a JMRI-based application by Rodney Black for controlling and operating a model railroad. There's more information on the CATS web site.
is a great, free tool for designing your layout,
developed by a group of model railroaders.
XtrkCadReader is a JMRI tool built by Giorgio Terdina to take layout information created by XTrackCAD (XTC files) and convert it to a form that JMRI can read (XML files).
This tool lets you import your physical layout design from XTrkCad directly into JMRI so you can easily set up controls for the layout you've built.
A "Decoder ID" page has been added to the web.
Automagically created from the current DecoderPro definitions,
it provides easy access to all sorts of information about decoders.
Contribute more information to our decoder definitions, and help these pages become even more useful!
JMRI is an informal open-source software group.
We do this for the joy of model railroading, and don't produce anything for profit.
One of our members has spent the past four years in the Federal Courts defending our right to continue against an individual who has attacked us with bogus patent threats, cybersquatting, copyright infringement and other illegal acts.
We are extremely pleased to announce that this case has now been settled. The agreement ends the dispute, and gives everybody involved a way to move forward. This is a victory for JMRI and open-source software in general.
Sun Microsystems (now part of Oracle)
has awarded JMRI a
2006 Duke's Choice award.
Also called a "Dukie", this award is given
annually to "some of the most clever, practical, and inspirational Java technology applications on the planet".
The award was presented at the
annual JavaOne conference on May 14th by James Gosling.
JMRI won for it's community, it's use of Java technology to empower people all over the world to contribute, and for the impact it's had.