Train Sim World 6: BR Class 20 'Chopper'

Train Sim World 6: BR Class 20 “Chopper” Loco Add-On is a downloadable content pack developed and published by Dovetail Games. It was released on August 26, 2025, and is designed as an expansion for the base Train Sim World 6 platform. This DLC does not function as a standalone product; players need to own both Train Sim World 6 and the Tees Valley Line route add-on in order to use the Class 20 content.

The DLC brings into the game the BR Class 20 diesel locomotive (often nicknamed “Chopper”) in its BR Railfreight livery, modeled with high attention to detail. The addon includes an accompanying PGA hopper wagon, three new scenarios, and interactive training modules tailored for the Tees Valley Line. The locomotive is operable in Timetable Mode on both the Tees Valley Line and the West Somerset Railway, and it’s built using Dovetail’s SimuGraph vehicle dynamics engine atop the Unreal Engine 4 framework for realistic performance, sound, and handling behavior.

In terms of promotion, Dovetail Games positioned the Class 20 as a beloved classic among British railway enthusiasts, highlighting its historic significance and distinct engine noise (the “helicopter-sound” under load) in marketing materials. They also ran a limited promotion at launch with a special price for a period, encouraging both existing and new users to pick it up. The Steam store page and community hub were key points for announcements, with Dovetail leveraging its brand and past locomotive releases to create anticipation within its train sim audience.

Reception for the Class 20 “Chopper” add-on appears to be still developing. At launch, there were no user reviews on Steam, indicating that adoption had just begun. Among simulation fans and in community forums, the Class 20 is appreciated for its authentic sounds, detailed model, and challenging driving experience—some users praise features like dual-cabs or unique characteristics (e.g. worn horns in certain units). Critiques tend to focus on the fact that the DLC is dependent on owning Tees Valley Line and that it may not fully exploit newer features of the Train Sim World 6 base engine. Overall, it is regarded as a solid addition for enthusiasts of British diesel traction and legacy locomotives.