Ram Speed

Source

Garrison Capacity

Basically all infantry and foot archer type units can garrison inside a ram. Exceptions are monks, petards and kings. In the Forgotten Empires Expansion villagers are also able to be garrisoned inside.

Battering and Capped Rams have a total capacity of 4, while the Siege Ram increases the capacity to 6 units.

Speed

The ungarrisoned ram has a base speed which is shown below.

Battering/Capped Ram  0.5 tiles/s
Siege Ram             0.6 tiles/s

Every garrisoned infantry increases the speed of the ram by 0.05 tiles/s regardless of the speed of the unit. Foot archers, skirmishers and hand cannoneers do not increase the speed of the ram.

Ram Type 0 Units 1 Unit 2 Units 3 Units 4 Units 5 Units 6 Units
Battering/Capped 0.5 0.55 0.6 0.65 0.7 X X
Siege 0.6 0.65 0.7 0.75 0.8 0.85 0.9

Modifiers on the speed of siege units are only applied to the base speed of the ram and not to the speed contributed by garrisoned units.

Math

(total ram speed) = (base speed) * (speed modifiers) + 0.05 * (units garrisoned)