Automation with JMRI

JMRI provides powerful tools for automating your layout, from simple signal logic to complex operational sequences.

Logix: The Logic Engine

Logix evaluates conditions and triggers actions - like IF/THEN statements for your layout.

Creating a Logix

1. Go to Tools → Tables → Logix
2. Click "Add"
3. Create Conditionals (the IF part)
4. Add Actions (the THEN part)

Example: Automatic Crossing Gates

Conditional: IF Block 5 is OCCUPIED

Actions:

• Set Signal "CrossingLights" to FLASHING RED
• Throw Turnout "CrossingGate" to CLOSED

Signal Mast Logic

For prototype signaling, use Signal Mast Logic instead of simple signal logic.

Setup Steps

1. Define Signal Masts (the physical signals)
2. Create Signal Mast Logic entries
3. Specify the mast being controlled
4. Set watched blocks and turnouts
5. JMRI calculates correct aspects automatically

Aspect Calculation

Signal Mast Logic considers:

• Block occupancy ahead
• Turnout positions
• Next signal's aspect
• Speed limits

Automatic Train Running

Use Dispatcher for automatic train operation:

1. Define Sections (track segments)
2. Create Transit (path through sections)
3. Allocate sections to a train
4. Set auto-run parameters

The train will follow signals, stop at red, and proceed automatically.

Python Scripting

For ultimate flexibility, write Jython scripts:

import jmri

Get a turnout

turnout = turnouts.getTurnout("LT1")

Throw it

turnout.setState(THROWN)

Scripts can respond to events, create sequences, and integrate external systems.