About
Chris Sawyer's Locomotion is a 2004 transport-company simulation game by Chris Sawyer, published by Atari Interactive and developed as a spiritual successor to Transport Tycoon. OpenLoco is an open-source re-implementation of Chris Sawyer's Locomotion in C++, following the model of OpenTTD and OpenRCT2. As of December 2025 the team reports the full reimplementation of the game is complete, and pre-built releases are provided for Windows, Linux and macOS.
How it differs from the original
The original was written in x86 assembly on top of the RollerCoaster Tycoon 2 engine; OpenLoco is a C++ rewrite that does not share code with OpenRCT2. The team's stated next goals are solid multiplayer and higher map and vehicle limits, though limits stay tied to the original save format until a new one is created.
Getting started
Download a release from the project's GitHub page (Windows 64/32-bit, Linux 64-bit, macOS arm64); the macOS builds are unsigned, so Gatekeeper may block them. You need the asset files from an original copy of Chris Sawyer's Locomotion, available on Steam or GOG.
Media
Additional notes
- Platform
- No builds are provided for BSD systems; those users must compile the game themselves.