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Movement
Controlling Unit Movement Abilities
Tanya can go into the water, so can seals. Other InfantryTypes can't. Some vehicles can also go over water, while others can't. It is not dependant on the locomotor, the MovementZone and SpeedType control this. For more information, refer to the MovementZone, SpeedType, MovementRestrictedTo articles.
Tracked vs Wheeled
[General] TrackedUphill=1.0 TrackedDownhill=1.2 WheeledUphill=1.0 WheeledDownhill=1.2
These are multipliers to units' speed when climbing up/down hill.