Build the world. Then run a train through it.
RenRail is RenLUG’s LEGO® train and collaborative train-layout program for Central Florida AFOLs.
RenRail is RenLUG’s train program — collaborative world-building layouts at select events across Central Florida. When the layout is ready, the train doesn’t just run in a loop. It thinks. It responds. And with RenRail Interactive, sometimes you’re the one driving it — sensors, automation, and real-time audience controls that put the railway in visitors’ hands.
30+
Locomotives in member collections
Fresh
build at every event
Free
included with RenLUG membership
WHAT WE DO
RenLUG is a broad AFOL community — trains are one part of what we do, not the whole thing. But at select events throughout the year, members bring their locomotives, MOCs, and ideas together and build a world from scratch. Then run a train through it.
Past layouts have included waterfront harbor cities with working trestle bridges, winter villages, zoo and city streetscapes, and theme park scenes. The train connects it all — but the world around it is what makes it worth stopping to look at.
Not every show. But when we set up, we build something worth stopping to look at.
Layouts from select RenLUG events — each one built fresh from member contributions.
A different world every time
There’s no permanent display, no fixed design, no blueprint you have to follow. Each layout is a collaborative build — which means there’s always a problem to solve, a gap to fill, a scene that needs something only you thought to bring.
The train runs through whatever we build together. That part’s the fun.
Completely different layout personalities — same program, same members, different world every time.
How a RenRail layout comes together
Every RenLUG train layout is modular by design — members build their own sections independently, bring them to the event, and connect them into a single cohesive world. No two sections have to look alike. The standards exist so everything fits together when it counts.
Members build on MILS plates (Modular Integrated Landscaping System) — green for city layouts, white for winter village, tan for western and Spaceport 1999. Our double mainline runs 9v track, which means any powered train system works on it. Tunnel clearances, train widths, and height limits are all documented so your build shows up ready to run without surprises on setup day.
Before each event, the layout coordinator sends a call for participation — how many baseplates are you bringing? That’s how the layout gets designed around the space. Show up with your section, connect it to your neighbors, and watch the whole thing come to life. Full Train and Track Standards →
Any LUG can run trains in a loop.
RenRail Interactive is the infrastructure and programming to run trains that respond, route, and adapt.
Onboard camera — riding through Ren City
A camera mounted on the locomotive captures what the train sees as it runs through the layout — the world RenRail Interactive is built to run through.
Why RenRail Interactive exists
RenLUG’s founders come from competitive robotics — FIRST LEGO League and beyond. That background shapes everything about how RenRail Interactive is built: sensors that read the environment, logic that makes decisions, and controls that put real agency in users’ hands. Running trains in a loop is easy. Building a railway that thinks is the interesting problem.
HOW IT WORKS — THREE LAYERS
01
The track tells the train what to do
Colored tiles embedded in the layout trigger specific actions as the train passes over them — slow here, stop here, switch here. The track itself carries the instruction. Physical, visible, immediate.
02
The train knows where it is
Distance sensors handle position awareness — detecting where trains are relative to each other, managing spacing, and enabling point-to-point automation like the trolley that runs a straight line back and forth without any manual control.
03
The audience drives
A tablet in visitor hands lets them select a train, choose a route, set speed, and throw switches. Built-in safeguards prevent conflicting commands — real control, real consequences, real engineering. No constant train wrecks.
Sensing → processing → control. The same logic loop that runs a First LEGO League robot, scaled up to a city-sized railway.
COLOR-CODED TRACK ACTIONS
The colored tile system is the heart of RenRail Interactive’s automation. Each color maps to a specific track action — the layout is programmed by the tiles you lay, not just by code you write. The cause and effect is visible to anyone watching.
🔴 Stop — train halts at this point until cleared
🟡 Slow — train reduces speed through this zone
🟢 Switch route — triggers a track switch
🔵 Reverse — train changes direction
🟣 Trigger action — fires a custom programmed event
Tile colors and their actions are configurable — the layout is reprogrammable by rearranging bricks.
THE TECH STACK
RenRail Interactive runs on a combination of LEGO Mindstorms hardware and PyBricks — an open-source Python-based firmware for LEGO programmable bricks. Color sensors on the trains read the tiles. Distance sensors manage spacing and point-to-point routing. Tablet controls interface with the system in real time.
Convention lighting is a real constraint — standard IR sensors are unreliable in bright or variable light. RenRail Interactive uses color and distance sensors that perform consistently in convention environments.
Built on PyBricks — open-source Python firmware for LEGO® programmable bricks →
TWO MODES, ONE RAILWAY
RenRail
Standard layout — collaborative world-building at select events. Any member can contribute a section.
RenRail Interactive
Full sensor + automation + audience control experience. Staffed events where visitor engagement is the focus.
Free
Included with RenLUG membership. Trains, track, and infrastructure provided by member collections.
Got trains? Bring them. Into robotics? Even better.
Several members bring large personal collections to every layout — locomotives, track, and infrastructure are covered. What makes a great RenRail build is people who want to make something worth stopping to look at.
Whether you’re a dedicated train builder, a city MOC builder who wants to see a train run through your street scene, a programmer with ideas about what a smarter layout could do, or just someone who wants to help engineer something cool at a public event — there’s a place for you here.
You don’t need to own a single piece of track. Show up, help build, help program, bring your ideas. RenLUG membership is free. RenRail comes with it.
RenRail Interactive is built at the intersection of LEGO trains and programmable systems. We’re looking for members who are passionate about either — or both.
Find us at events
RenRail appears at select RenLUG events across Central Florida. RenRail Interactive — with full sensor, automation, and audience control experience — appears at staffed events where visitor engagement is the focus. Check our events calendar to see what’s coming next.