JMRI Manuals



JMRI® v4.x
JMRI® v3.10
JMRI® v2.14

Supported Computers

JMRI® Manuals

Applications with Online Manual:

JMRI® current DecoderPro v4.x
PanelPro™ v4.x
OperationsPro™ v4.x
DispatcherPro™ v4.x
General Set Up v4.x
JMRI® v3.10 DecoderPro3 v3.6
DecoderPro® v3.6
OperationsPro™ v3.6-3.10
JMRI® v2.14
JMRI® v2.14.1
DecoderPro 3 v2.14 Printable PDF (6.7MB)

JMRI® Applications

JMRI is a Java-based cross-platform program suite for model railroaders.
It contains modular applications for:

All this capability is contained in one install.

Take it Step by Step

JMRI levels

Our general advice is to start with the basics. For that we suggest you start setting up a simple track connected to your Command Station first.
When train(s) run and a turnout responds to your hand held throttle, it's time to open the Hardware Help (use the Hardware tab at the top of the page).
Next is trying to do basic things with PanelPro, for example using a JMRI Throttle to run a loco.
Once that is operating like you expect, comes the time to build a Panel, fill your Roster, etc.
Make some notes for yourself, sketch a simple diagram to way you conceive you set up. Often that helps better than words to get things sorted (and remember 2 years later why you chose to type that funny turnout name).

You're not discouraged to dive in, but by taking on JMRI - or any powerful, but complex thing - one step at a time you sort of build a solid foundation that will pay for itself in due time.
Gradually build on you foundation concepts of the program and pick up elements of interest by following some of the links at the bottom of the left sidebar on the JMRI web Help.

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

System Requirements

JMRI® requires that Java be installed, whether your computer is Mac, Windows, or Linux based.

Version 2.12 can run on any computer system that will run Java 1.5 or later.
Version 2.14.1 requires Java 1.5 (or 1.6 if you wish for drag & drop)
Version 3.10.1 requires Java 1.7 or later.
Version 4.2 requires Java 1.8.

More on Java versions and hardware requirements.
Get the latest Java as a free download at: