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Two changes that only work together: the first on its own lets a heavy freight train brake less on a descent than it needs (in testing an ET42 with 30 loaded wagons overran the stop signal by 16-48 m at 20 per mille), the second makes the hold on a descent what it should be. The comparison that decides whether the AI may skip its reaction time between two brake steps stays on the brake-only demand, as before: it is about how much brake is asked for, and a heavy train in G approaching a stop on a descent needs its brake built up at once. Compared in the resultant frame, that train built up its brake one step per reaction time and overran the signal (16 copies of the ET42 train, x20: 22 of 32 overruns with the comparison moved, 0 of 48 with it kept). 1. Compare the measured deceleration in the same frame. Going downhill, adjust_desired_speed_for_current_speed() subtracts the gravity component from AccDesired, so that IncBrake() sizes the handle position for what the brake alone has to deliver. control_braking_force() then compares that brake-only value with AbsAccS, which is the resultant acceleration and already contains the gravity. On a 20 per mille descent the two differ by about 0.2 m/s2, so the AI asked for more braking than the target needed and then released, and repeated that. Keep the subtracted part in fAccDesiredGravity and add it back wherever AccDesired is compared with AbsAccS. It is zero everywhere else (flat, uphill, braking test), so the behaviour there does not change. 2. Hold the speed with one continuous law. On a descent the AI looks ahead to decide whether it will exceed the target speed. The look-ahead was (1 - a0) * 30 / 3.6 s, a few seconds, while a pneumatic brake in G takes tens of seconds to apply or to release; the AI therefore acted on an estimate the train had already left behind. The demand then jumped between the braking threshold above the target and a lerp towards full acceleration below it, and with the brake that slow this turned into long alternating applications and releases. - look ahead for half the brake application time while the train is speeding up and half the release time while it is slowing down (brake_response_horizon), never less than before; - use one law on both sides of the target, proportional to the predicted difference, and hold a band just below the limit that widens with the gradient (pneumatic up to 3 km/h, EP/electric up to 1.5 km/h); - once below a lower limit ahead, hold that limit instead of speeding up towards the line speed and braking again.
MaSzyna - Railway vehicle simulator
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MaSzyna executable source code is licensed under the MPL 2.0 and comes with a large pack of free assets under a custom license.
Table of Contents
Getting Started
MaSzyna compiles and runs natively on Linux and Windows. Other platforms are not tested.
Heads-up
Our dev team is small; we keep improving the build process, but issues may still occur. If you get stuck, please ask on the official Discord server.
Prerequisites
For runtime requirements see Minimum Requirements.
1) Software (oldest tested in parentheses)
Note: MinGW is currently not supported.
2) Libraries (oldest tested in parentheses)
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GLFW 3.x (3.2.1)
If a link error occurs, pass-DGLFW3_LIBRARIES="<path>"to CMake. -
GLM (0.9.9.0)
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libserialport (0.1.1)
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libsndfile (1.0.28)
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LuaJIT (2.0.5)
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GLEW (2.1.0)
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libpng (1.6.34)
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OpenAL (1.18.2)
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pthread
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Python 3.14 (64-bit; headers and import library required for embedding)
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Asio (1.12)
3) Graphics API
- OpenGL 3.0 or newer
- DirectX 12 via NVRHI (optional, Windows only, for Better Renderer)
CMake flags
| Flag | Meaning |
|---|---|
-DCMAKE_BUILD_TYPE=Debug |
Debug build |
-DCMAKE_BUILD_TYPE=Release |
Release build |
-DCMAKE_BUILD_TYPE=RelWithDebInfo |
Release build with debug symbols |
-DWITH_BETTER_RENDERER=ON/OFF |
Enable/disable NVRHI-based renderer |
-DPython3_ROOT_DIR=<path> |
Root of the Python 3.14 install on Windows (python.exe, Lib, DLLs) for embed/copy steps; on Linux, optional if CMake picks the wrong interpreter |
Linux note:
WITH_BETTER_RENDERERuses DirectX 12 through NVRHI and is not supported on Linux.
Windows
Install Python 3.14 x64 from python.org and include the optional Python native development feature (headers and .lib for embedding). Pass -DPython3_ROOT_DIR="C:\Path\To\Python314" on the cmake line when you want the layout under that directory used for embedding and for copying Lib / DLLs next to the executable.
AppVeyor CI builds with the worker image’s preinstalled Python at C:/Python314-x64 (see appveyor.yml: -DPython3_ROOT_DIR=...).
# Clone repository with submodules
git clone --recursive https://github.com/MaSzyna-EU07/maszyna.git
cd maszyna
# Init vcpkg
call setup.bat
# Create directory for CMake build files
mkdir build
cd build
# Generate CMake project (replace %CONFIG% with Debug/Release/RelWithDebInfo)
cmake .. -G "Visual Studio 17 2022" -A x64 -DCMAKE_BUILD_TYPE=%CONFIG%
# Build (replace %CONFIG% accordingly)
cmake --build . --config %CONFIG% --parallel
Linux
# Install dependencies (Fedora/RHEL family)
sudo dnf install -y \
@development-tools \
cmake \
mesa-libGL-devel \
glew-devel \
glfw-devel \
python3.14-devel \
libpng-devel \
openal-soft-devel \
luajit-devel \
libserialport-devel \
libsndfile-devel \
gcc \
g++ \
wayland-devel \
wayland-protocols-devel \
libxkbcommon-devel
# Clone repository with submodules
git clone --recursive https://github.com/MaSzyna-EU07/maszyna.git
cd maszyna
# Create directory for CMake build files
mkdir build
cd build
# Generate Makefiles (NVRHI is not supported on Linux)
cmake .. -DWITH_BETTER_RENDERER=OFF
# Compile using all cores
make -j"$(nproc)"
Tip (Ubuntu/Debian): Package names differ; install equivalent
build-essential,libgl1-mesa-dev,libglew-dev,libglfw3-dev,python3.14-dev,libpng-dev,libopenal-dev,libluajit-5.1-dev,libserialport-dev,libsndfile1-dev, and Wayland/X11 dev packages as needed.
Installing
There is no make install yet. Copy the built executable to your MaSzyna installation manually.
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Output directory:
./bin -
File name format:
eu07_YYYY-MM-DD_<commit>[_d]-
YYYY-MM-DD– build date -
<commit>– short commit hash -
_d– present in Debug builds
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If you already have the MaSzyna assets, copy the executable to the install dir. Assets can be downloaded from eu07.pl.
Rainsted on Linux
If Rainsted (a third‑party starter) fails to detect the executable under Linux, you can create a small wrapper script named eu07.exe:
#!/bin/sh
./eu07 "$1" "$2" "$3" "$4" "$5"
If detection still fails, padding the file (with comments) up to ~1 MB may help.
Known Issues
-
GLFW linking – On some systems you must provide the GLFW library path explicitly with
-DGLFW3_LIBRARIES. -
X11/Wayland linking order – Linking order of X11 and related libs can matter.
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NVRHI on Linux – The NVRHI/"Better Renderer" path targets DirectX 12 and is currently unsupported on Linux.
Support
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Official Discord Server: https://discord.gg/qAh9ctWPQv
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Project page: https://eu07.pl/
Minimum requirements
- OS: Windows 10 64-bit
- Processor: 2 core at least 2 GHz (e.g. Intel Core i3-2100 / AMD Athlon II X2)
- RAM: 6 GB RAM
- Graphics Card: supporting OpenGL 3.3 with at least 1GB VRAM
- 150 GB of free disk space
- Sound card supporting OpenAL with stereo
- Optional COM ports for custom control panel setups.
License
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Source code: MPL 2.0
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Assets: Custom license