From Lexicanum

Tank	Super Heavy Tank - Heavy Tank - Grav-tank - Battle Tank - Tank Destroyer - Air Defence Tank - Armoured Personnel Carrier - Artillery Tank - Siege Tank

Siege Tanks are Tanks designed to combat enemy fortifications, especially bunkers and fortified positions.

Construction

Siege Tanks tend to have a short ranged gun as range is not much of a factor in urban terrain, while also having thicker top armour to prevent damage from shelling from the upper floors of buildings.

Use

Siege Tanks are mostly used in urban areas or strongholds, against fixed fortifications and emplacements.

Types of Siege Tank

Note that the following list does not include Super Heavy Tanks or Heavy Tanks as these have their own lists.

Imperium

Imperial Guard

• Demolisher
• Medusa Siege Tank
• Thunderer

Space Marines

• Vindicator

Sources

• Codices of the Imperial Guard all editions
• Codices of the Space Marines all editions