A-Train 9 PRIME LINE launches on Steam December 9

ARTDINK's railway-and-city simulator pairs objective-driven management with a no-budget construction sandbox; Japan gets it around noon on December 10.

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TLDR

ARTDINK will release A-Train 9 PRIME LINE for PC via Steam on December 9, 2026, with English and Japanese text support. Its two modes split the experience between budget-limited scenarios and unrestricted city building, while detailed railway tools cover curved tracks, gradients, timetables and trains of up to 16 cars. The international edition includes 243 JR vehicles, and players can import custom trains or subscribe to Steam Workshop creations. ARTDINK's Japanese site lists a December 10 noon launch in Japan because of the time-zone difference.

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ARTDINK will release A-Train 9 PRIME LINE for PC through Steam on December 9, 2026. The Steam product page lists English and Japanese interface and subtitle support, while ARTDINK's Japanese site places the domestic release at around noon on December 10. The two dates describe the same global rollout across time zones, not separate editions arriving a day apart.

The company bills PRIME LINE as the most complete version of its long-running railway-and-city simulator. Players become the president of a railway company, connect separate regions and use passenger traffic to drive construction around their network. Tracks and roads can follow adjustable curves and gradients, individual trains can run on detailed schedules, and formations can stretch to 16 cars.

A management game and a construction sandbox

The game divides city building into two approaches. Game Mode gives each city objectives and limited funds, turning route choices and spending into management decisions. Construction Mode removes the financial constraint so players can reshape terrain and build anything from dense urban centers to rural landscapes.

The international Steam edition includes 243 licensed JR railway vehicles, and the store warns that its rolling-stock count differs from the Japanese release. Players can also import vehicles made with the separately sold A-Train9 TRAIN CONSTRUCTION tool or add community creations through Steam Workshop.

City design extends beyond the rail network. ARTDINK says players can place roads, shops, homes and landmarks to build recognizably Japanese urban and rural scenes, then watch those places change with the time of day and seasons. Camera options include the driver's seat, passenger views and fixed observation points, turning the finished network into something players can tour as well as manage.

The page lists Steam achievements, Steam Cloud, a level editor and family sharing alongside its single-player campaign. It also includes a specific generative-AI disclosure: the developer says the technology was used while editing the main visual and prototyping some music tracks. That disclosure does not say generative AI created the full game's art or soundtrack.

A-Train 9 PRIME LINE launches on Steam December 9

ARTDINK's railway-and-city simulator pairs objective-driven management with a no-budget construction sandbox; Japan gets it around noon on December 10.

1 Source, 16h ago, first seen 16h ago

TLDR

Featured Source

A-Train 9 PRIME LINE launches on Steam December 9

TLDR

A management game and a construction sandbox

A-Train 9 PRIME LINE launches on Steam December 9

TLDR

A management game and a construction sandbox

1 Source

Combined views

A management game and a construction sandbox

A management game and a construction sandbox

Combined views

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Summary

Sentiment

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