Diesel Engines

Effects

• Ship: Speed +15 %

Requires

• Dry DocksColonial Age

Researched at

• Landing SiteStone Age
• ShipyardBronze Age
• Harbor YardRenaissance
• Steam ShipyardIndustrialization
• Naval YardModern Age

Unlocks

• Early TankModern Age
• DreadnoughtModern Age
• Modern CruiserModern Age
• Bismarck IModern Age
• Tiger IModern Age
• Tiger IIModern Age