Steel Republic Rail Defender

About this game

S.R.R.D. is a hybrid of Strategy Railroad Logistics, with resource gathering, base building, and tower defense mechanics.

The Initial game released as an episode #1

A DEMO mission of the game can be found on the page for Steel Republic please go to the SRRD home page link.

Save the Steel Republic:

Play through a single-player Campaign of six mission game levels, with three levels of enemy bot difficulty. New episodes will contain more interactive features and present a new set of challenges. The episodes will be released as a patch/update and will not require a new purchase.

Logistics Wins Wars

You begin each Single Player level with limited supplies, and will need to allocate rolling stock and locomotives to gathering resources and building out your defensive positions. To be successful you will need to learn the best logistics plan for resources and routes in order to optimize income, all while keeping your trains and infrastructure safe from enemy raiders. There are three primary resources to gather along the rail system, and two secondary products - Steel and Supplies - to produce at your home Factory.

Defend Your Operations

The Deploy-able Turrets, Mobile Outposts, and Forward Bases will need to be built up along the rail system to keep the enemy out. Combat units will attempt to take down your Command HQ, but also will deny you access to resources and routes. The better your defensive array the more resources your can gather from the map.

Take Them Out

While the early game is all about defending, to win you will need to build up weaponry and bring the battle to the enemy's home base to destroy it. Spend resources to build up a stock of Combat Locomotive units and advanced Combat Railcars. For additional supporting fire you can build and deploy Railway Artillery to fire on the enemy from far across the map.

Retro Historical Setting

The setting and story is fictional, but with a historic mid-20th century Cold War era visual design. Diesel Locomotive Power, Kinetic Weaponry, Heavy Industry, and off-road light vehicles define the technical era.

Latest news

• Patch Notes·5 Oct 2025Official

  Updated build to address the Unity Engine security patch

  This version has no changes to the game. This is a new build made with an updated version of the Unity Editor application, in response to their public notice on Oct. 2nd of a severe vulnerability.
  Read full article on Community Announcements (SRRD_Dev)

• Patch Notes·21 Nov 2024Official

  Small fix update, No feature changes

  Tutorials - 0.98 patch update Nov. 20
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• Patch Notes·28 Jul 2024Official

  July patch for bug fixes

  Some fixes for a few items are in this patch enemy vehicle obstacles avoidance bugs enemy vehicle tilt on terrain bug turrets destroyed on placing bug
  Read full article on Community Announcements (SRRD_Dev)

• Patch Notes·2 Jun 2024Official

  June 1st Update to 0.944 Notes

  Update Notes - June 1st Includes an important fix for a bug while zooming with the mouse scroll wheel Turrets and the Railside Outpost can be scrapped for some resources, the amount returned depends on structure health and type. Camera Rotation controls will now Orbit the followed structure or unit, or the terrain at screen center. Center mouse button will also allow both orbit rotate and camera tilt. When browsing rail units in inventory for deploying, a tool tip will pop up to give descriptions/stats. A switch to use a cab view camera was added to Locomotive units.
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• Patch Notes·17 May 2024Official

  May Update - QoL Features & Changes

  May Update features: Trains being deployed at the Railyard now have an "undo" button to put cars back in inventory. {STEAM_CLAN_IMAGE}/43961220/df4503a0a92f9b85b1fd4cf0a000e81003509020.jpg Enemy Vehicles will show as blips on the mini-map, within a certain range of player structures. {STEAM_CLAN_IMAGE}/43961220/c796d543a15448f1f6310fe58e1112db36e6fa1b.jpg Locomotives will have a function to delete a Halt Marker if it has been placed. Halt Markers on the ground can be selected, which opens the controls for their parent Locomotive. This will allow it to be deleted, or placed again quickly. {STEAM_CLAN_IMAGE}/43961220/f025d60c06abad47242f30230e6ea329a1d3caa0.jpg Turrets will show their Max range as a ring when being placed, and when selected. {STEAM_CLAN_IMAGE}/43961220/9281e3772bab139aa3bac362f23d45b530df6cbc.jpg The Railcar Foundry will show exactly the amount of each missing resource needed to build a unit when selected, instead of a generic error message. {STEAM_CLAN_IMAGE}/43961220/4ce84e8ae0957faa701077adcff8273127b4d742.jpg Also fixed: The Mouse Wheel will scroll train unit lists in the GUI without changing the main camera zoom level.
  Read full article on Community Announcements (SRRD_Dev)