Dreadnought-class ship
A Dreadnought-class ship is a class of ships used to front a Cyberman invasion.
It is a massive Cyberman-shaped giant capable of walking. It contains an energy weapon in its left hand and a missile launcher in its right. Inside its chest is a factory for Cyber-conversion. The mouth piece also acted as an observation deck where the Controlling Cyber unit would be stationed.
One such vessel was the CyberKing.
It is possible that this type of vessel has been used before by the Mondasian Cybermen as the Doctor seemed to recognise the ship in such a way as he could name it and cite its function. It is also probable that this variant of Dreadnought class ship is quite primitive and could be improved as the Cybermen were stuck in the Victorian era with limited time, space and technology to work with.