Train simulator mods: which simulators support custom routes and free mods?
Compare free train simulator mods and custom-route support in Train Simulator Classic, Open Rails, MSTS, Trainz, SimRail and Train Sim World.
Train Simulator Classic, Trainz, Open Rails/Microsoft Train Simulator and OpenBVE all support custom routes and free community mods. Trainz is the easiest route builder; Train Simulator Classic has one of the largest traditional add-on ecosystems; Open Rails is best for compatible MSTS content. Train Sim World and SimRail are substantially more restricted.
Best train simulators for mods and custom routes
For most PC users, the choice comes down to Train Simulator Classic for downloadable add-ons, Trainz for route building, or Open Rails and OpenBVE for free simulator software.
This comparison refers mainly to PC editions. Console versions generally cannot accept arbitrary files, and an in-game livery or scenario-sharing feature is not equivalent to full mod support.
| Simulator | Custom-route support | Typical free content | Best choice when |
|---|---|---|---|
| Train Simulator Classic | Built-in World Editor for creating, cloning and modifying routes | Routes, scenarios, reskins, rolling stock, sounds, scenery and operational enhancements | You want an established catalogue of traditional train simulator mods |
| Trainz | Surveyor combines track, terrain, scenery and operating features in a visual editor | Routes, sessions, locomotives, track and thousands of scenery assets | You want to construct a railway from scratch |
| Open Rails and MSTS | Runs compatible MSTS-format routes; creation relies on less unified MSTS-era and community tools | Routes, locomotives, consists, activities, sounds, scenery and utilities | You own legacy MSTS content or want a free engine for compatible routes |
| OpenBVE | Routes and trains can be created in editable formats | A large proportion of the available route and train content is freeware | You want a free simulator and do not mind technical file handling |
| Train Sim World | Official route-development tooling is available for supported PC releases | Suitable PC packages plus liveries and scenarios shared through in-game systems | Modding is secondary to the driving experience |
| SimRail | No comparably mature, general-purpose ecosystem for downloadable custom routes | More limited and dependent on the content mechanisms supported by the installed release | Multiplayer driving and dispatching matter more than extensive mod support |
Do not confuse Train Simulator Classic, Train Sim World and Microsoft Train Simulator. They are separate products with incompatible routes, trains and package formats. A TSC mod cannot be installed into Open Rails, and an MSTS locomotive cannot simply be copied into TSC.
Are free train simulator mods really free?
A free download is not necessarily a self-contained add-on: it may require the base simulator, commercial routes, rolling stock or scenery packs.
This is particularly common with Train Simulator Classic mods. A freeware route may reference track from one paid route, buildings from another and locomotives from several additional products. Without those dependencies, the route may load with bare ground, missing track or scenarios that cannot start.
- Train Simulator Classic and Trainz: The PC simulators normally require a paid licence, although many community add-ons are free.
- Open Rails and OpenBVE: The simulator software is free, but an individual route may still depend on separately licensed assets.
- Microsoft Train Simulator content: Free Open Rails does not make Microsoft's original MSTS assets freeware. A route requiring default MSTS files still needs a legal source for them.
- Freeware licences: Free to use does not automatically mean permission to modify, repackage or redistribute the files.
A mistake we see constantly is treating the dependency list as optional. Check the required simulator, route version, rolling stock, scenery packs and installation method before downloading a large package.
How do I install train simulator mods safely?
The safe method is to confirm the exact simulator and dependencies, preserve the supplied folder structure, and test one new add-on at a time.
- Identify the simulator. Confirm that the package is for Train Simulator Classic, Trainz, Open Rails, MSTS, OpenBVE, Train Sim World or SimRail. Similar names do not imply compatibility.
- Read the included instructions. Look for required routes, rolling stock, asset packs, simulator builds and any special installation order.
- Inspect the archive. A route may be nested one folder too deep, contain a package file that must be imported, or include separate documentation and assets. Do not move files until you understand the structure.
- Back up modified content. Clone routes before editing them and retain copies of any original files replaced by sound, physics or texture mods.
- Use the intended installer or content manager. Do not copy a package into an arbitrary game folder because its extension is unfamiliar.
- Test immediately. Load the route and a supplied scenario before adding anything else. If it fails, the last package is easier to isolate.
Installing a Train Simulator Classic mod download
TSC downloads commonly arrive as .rwp packages or archives containing Assets and Content folders. Install an .rwp through the game's Utilities package manager; merge supplied folders with the RailWorks installation folder only when the author's instructions require it.
Never place an unopened .rwp file inside Assets, and do not assume every archive belongs in Content/Routes. Routes and scenarios live under content folders, while locomotives, scenery, sounds and scripts normally belong under provider and product folders in Assets. Our step-by-step instructions for installing TSC mods cover both package-manager and manual installations.
Open Rails mods and Microsoft Train Simulator mods
Open Rails normally reads an organised content source; MSTS-style add-ons should not be dumped into the Open Rails program folder. Preserve the expected structure containing folders such as ROUTES, TRAINS, GLOBAL and SOUND, or retain a self-contained mini-route structure when one is supplied.
Some old MSTS installers expect an original installation path and may not recognise a standalone Open Rails setup. Routes can also reference default MSTS scenery, global track files, activities, paths, consists and rolling stock that the download does not include. Start with our guidance on setting up Open Rails and its content profiles, then check the prerequisites attached to any files in our freeware MSTS route and rolling-stock library.
Trainz and OpenBVE content
Trainz uses Content Manager to import packaged assets such as .cdp files and report missing or incompatible dependencies. A route and its session can be separate assets, so importing only the route may leave industries, consists or operating instructions absent.
OpenBVE packages vary. Some use a supported package mechanism, while older routes and trains require manual placement with their directory relationships intact. Renaming or reorganising folders can break route references to trains, objects and sounds.
Which train simulator is easiest for building custom routes?
Trainz is usually the easiest for a first custom route because Surveyor puts track laying, terrain shaping, scenery placement and railway operations into one integrated editor.
Train Simulator Classic is the stronger alternative when access to an established route and scenario ecosystem matters more than editor simplicity. Its World Editor is capable, but scenery is organised by provider and product, and those asset sets must be selected correctly while building. Our detailed comparison of TSC and Trainz for route building explains the practical differences.
Clone an existing TSC route before changing it. Updates, reinstalls or repairs can overwrite original files, while distributing a modified route does not give permission to include commercial scenery or somebody else's rolling stock. A shared route package should reference required assets rather than redistribute them without permission.
Open Rails is excellent for driving compatible custom routes, but it is not the easiest complete construction environment. OpenBVE offers considerable control through editable route definitions, though it rewards users comfortable with file structures and technical documentation.
Common mod failures and the fixes that work
Most broken train simulator mods are caused by the wrong simulator, a missing dependency, an incorrect folder level or an add-on built for a different content version.
| Symptom | Likely cause | What to check |
|---|---|---|
| Route does not appear | Package was not imported, files are nested incorrectly, or the route targets another simulator | Re-read the installation instructions and confirm the folder or package format |
| Terrain loads but track or buildings are missing | Required route or scenery assets are absent | Install the exact dependencies listed by the author; reinstalling the free route alone will not supply them |
| Scenario or activity will not start | Missing locomotive, consist, path, traffic service or script | Check the scenario requirements and use the simulator's log or content-status tools where available |
| Trainz reports missing or unknown dependencies | The route references assets not installed or incompatible with that Trainz build | Review each dependency in Content Manager rather than repeatedly importing the route package |
| Open Rails route loads but an activity fails | The route exists, but the required consist, path, service or MSTS stock does not | Read the Open Rails log and verify the complete activity dependency chain |
| A sound, physics or texture mod stops working after an update | Original files were restored or the mod no longer matches the installed release | Confirm compatibility before reinstalling the modification from a backup |
| The game crashes after several add-ons were installed | Conflicting scripts or an outdated package | Remove the additions in reverse order and test after each removal |
Do Train Sim World and SimRail support full route mods?
Train Sim World supports more user-created content on PC than on consoles, while SimRail should not be chosen primarily as a general-purpose route-modding platform.
Train Sim World
Supported PC releases provide official editor tooling for route and gameplay projects, and suitable community packages can be installed on PC. Development and packaging are substantially more involved than editing a Trainz or TSC route, and projects may depend on a particular Train Sim World release or on assets from specific content packs.
Console editions cannot load arbitrary PC mod packages. Shared liveries and scenarios are useful, but they do not provide unrestricted downloadable routes, locomotives or replacement files.
SimRail
SimRail's main strength is multiplayer railway operation and dispatching rather than a TSC-style catalogue of free route and rolling-stock downloads. Use only content methods supported by the installed release; replacing game files unofficially can be undone by updates and may cause compatibility problems in multiplayer.
Choose Train Simulator Classic or Trainz when custom routes and conventional train sim mods are the priority. Choose Open Rails or OpenBVE when the simulator itself must be free and you are prepared to manage route dependencies carefully.