The JMRI project is building tools for model railroad computer control. We want it to be usable to as many people as possible, so we're building it in Java to run anywhere, and we're trying to make it …

JMRI® Applications JMRI is a Java-based cross-platform program suite for model railroaders. It contains modular applications for: Programming of Digital Command Control (DCC) decoders (DecoderPro®) …

Clean Install If for any reason you wish to start totally clean and discard all previously stored Connections, Roster entries and Panels, run "Uninstall JMRI", found in the Windows Start Menu > All …

JMRI 5.15.6 is the next release of the current development series, containing the latest and greatest JMRI updates. The series is working toward the JMRI 5.16 production release, probably in June …

JMRI needs a "Java Runtime Environment" (JRE) to run but will work fine with the larger "Java Development Kit" (JDK). A JDK is only needed if you want to work on JMRI development, i.e. make …

JMRI: Signaling This page introduces Signaling, lists the JMRI Signaling Tools and points to more advanced methods. Modeling railroad signaling on a layout can be done in many different ways, …

JMRI: DecoderPro User Guide The JMRI libraries contain the DecoderPro application for programming DCC decoders. This page introduces the current application and how you may use it. It assumes you …

JMRI is designed so that features are implemented in the system-independent part as much as possible, with JMRI using system-dependent subparts only when really necessary. Access to system …

The JMRI libraries contain the PanelPro application for creating panels to control or follow your (virtual) model railroad. This page introduces the application, and how to use it.

JMRI: Hardware Support JMRI supports a wide range of DCC "command station"-style products from various model railroad automation vendors. We also support non-DCC layout accessories and …