The LA-assignment thread VIII: Way Too Much For Vampirism

[Thurbane]

That's because the maug in the statblock is wearing heavy armour though. Take it off and their base speed would be 60ft.

Hmm, interesting...so they either have a higher base move, or the ability to ignore armor speed reduction like dwarves do. Since the latter is not listed, the higher base speed makes more sense.

Personally, I would assume it's just a stat block error (60 ft speed seems a bit odd for a large Construct), but I can't back that up with any RAW.

I think the "cannot run" was a 3.0 rule for all Constructs, but appears to no longer be a default rule in 3.5.