The JMRI Manual
Installing JMRI
Starting JMRI Operations
Using JMRI Operations

JMRI® v3.0 Operations User's Guide


JMRI is a Java-based cross-platform application for model railroaders. JMRi contains applications for:

The programming of Digital Command Control (DCC) decoders, (DecoderPro®).
Programming decoders and using throttle run trains, DecoderPro3®

Drawing computer based panels for depicting a model railroad  layout , (PanelPro® ).
Controlling the layout , (Layout Editor).
Creating train manifests for duplicating railroad operations, Operations
Controlling the signals on the layout
Controlling  lighting and sound in the room, and so forth. (SoundPro®)

All this capability is contained in one program (JMRI) which has several “start-up” screens for the various applications.

The JMRI Operations Program is contained within the DecoderPro® and PanelPro® Programs and accessable through their main menu.


 JMRI® can run on any computer system that will run Java 1.6.0 or later, whether it is Macintosh, Windows, or Linux based. It does require that Java be installed on the computer. You can get Java as a free (but very large...) download at:

If this is your first visit to our manual we suggest that you take the DecoderPro® tour
to get an overview of what we're about to cover.

Note: All screen shots in this manual are from a Windows machine using the "Metal" User Interface option. While your screens will probably differ in some layout details, they will be essentially the same. All programming examples shown are with Digitrax PR3(MS100 mode) connected to Digitrax Super Chief Radio Command Station. Most of the decoders in locomotive samples will be Digitrax, except for sound examples.

Note: This entire manual has been updated to correspond to DecoderPro 3.0 and the HTML verified using HTML4 and Cascading Style Sheets. If the formatting looks odd, you probably need to update your browser.

Table of Contents

Installing JMRI

Starting Operations Program

DecoderPro® Main Window

Version Revision Date Editors Major Revisions
3.0 1/5/2013 Dale A. Tripp
Bruce Shanks
Updated from JMRI 2.14.1 and removed from DecoderPro® as separate Guide