Release Notes for JMRI 4.18 release

Date: December 23, 2019

From: Bob Jacobsen

Subject: Production Release 4.18 of JMRI/DecoderPro is available for download.

We are very pleased to announce that the 4.17 series of JMRI test releases has resulted in a version that's good enough to be recommended for general use, including by new users. We're therefore making that version, "Production Release 4.18" available for download today.


JMRI is now only available under the GNU General Public License. For more information, please see our copyright and licensing page.

Update From Older JMRI Versions

If you are currently using JMRI 4.11.9 or earlier, we strongly recommend that you update to JMRI 4.12 and make sure that's running OK before updating to this test release. Once you have JMRI 4.12 running OK, store your configuration and panel files and use those from then on. There have been a number of changes in serial port support, panel file format and configuration options since those earlier releases, and moving to the stable JMRI 4.12 release is a good way to work through any possible problems.

If you are currently using JMRI 4.7.3 or earlier on Linux or macOS (Windows doesn't need this), you must update to JMRI 4.12 and carrying out the migration process described in the JMRI 4.12 release note before updating to this release.

Known problems with this release

New warnings for this production release:

Older warnings

See the JMRI 4.16 release note for more warnings predating the 4.17 development series. These may be relevant to you if you're updating from an earlier version.

Download links:

Please note that the download links in this and future JMRI releases link to Github servers. People are welcome to distribute the download files further via other websites, etc. If you want to check that you've received original, unmodified versions, please check the files against the checksums shown below.

Changes since production release 4.16:

This production version is made from test releases 4.17.1 through 4.17.9. The full list of changes in those is available from our code repository.

Hardware Support




New / Updated decoder definitions

Doehler & Haas






Layout Editor


Turnouts, Lights, Sensors and other elements





Web Access