[Glossary](/glossary.md)/[Progression](/glossary/category/progression.md)

# On Track

A recurring event that discounts one tech tree line and pays bonuses for researching it.

Also known as on track event, on-track mission.

An On Track event picks a [Tier](/glossary/tier.md) X and puts everything leading to it on discount, with extra [experience](/glossary/experience.md) and credit missions along the way. Grinding that line during its event costs substantially less than grinding it cold.

It is worth planning around: a line researched off-event is money left on the table.

## Related terms

[Tech treeA nation's chart of researchable vehicles, where each one unlocks the vehicles above it.](/glossary/tech-tree.md)[ResearchSpending a vehicle's experience to unlock its modules and the vehicles that follow it in the tree.](/glossary/research.md)[CreditsThe main currency, earned every battle and spent on vehicles, modules, ammunition, repairs and equipment.](/glossary/credits.md)[Free experienceExperience that can be spent on any vehicle or module, accumulated as a small share of everything earned and convertible from elite vehicles with gold.](/glossary/free-experience.md)

[Every World of Tanks term](/glossary.md)

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