Train Sim World 6: BR Class 31

The Train Sim World 6: BR Class 31 Loco Add-On was developed and published by Dovetail Games, released on August 26, 2025, for the PC version of Train Sim World 6. This downloadable content (DLC) is designed to enhance the simulation experience by adding the BR Class 31 diesel-electric locomotive to the game. The BR Class 31 was introduced in the 1950s as part of British Rail's modernization plan, replacing steam traction with diesel power. Known affectionately by nicknames such as "Ped," "Gurgler," and "Gargoyle," the Class 31 became a backbone of British Rail's low-to-mid-range fleet, serving for decades across various regions.

In Train Sim World 6, the BR Class 31 is featured in its BR Corporate Blue livery, operating on the Tees Valley Line route. The DLC includes the Class 31/1 variant, equipped with a 1,500 hp engine, suitable for both passenger and freight services. Players can experience realistic operations with the inclusion of the PCA-V cement tank wagon, adding depth to freight scenarios. The locomotive boasts highly detailed, feature-rich driving cabs with accurate true-to-life performance and handling, powered by Dovetail Games' proprietary SimuGraph vehicle dynamics engine and Unreal Engine 4 technology. Additionally, the DLC offers authentic and detailed sound recordings, recorded from the real locomotives, enhancing the immersive experience.

Promotion for the BR Class 31 Loco Add-On emphasized its historical significance and authenticity. Dovetail Games highlighted the locomotive's role in the dawn of dieselization and its long-standing service across British Rail's network. Marketing materials showcased the BR Corporate Blue livery and the detailed modeling of the Class 31, appealing to both long-time fans of British railways and newcomers to the franchise. The DLC was positioned as a valuable addition for players seeking a more authentic and engaging simulation experience in the British rail network.

Reception of the BR Class 31 Loco Add-On has been generally positive. Players have praised the attention to detail and the immersive experience it provides. The accurate representation of the BR Class 31 and its operations has been well-received, offering a nostalgic experience for those familiar with British railways. Some players have noted minor issues, such as performance optimization concerns and occasional graphical glitches. Despite these minor drawbacks, the DLC is considered a valuable addition for players seeking a more dynamic and immersive experience in Train Sim World 6.