These machines are large. The size of mountains. Have not moved in millennia. And now they're awake again. And moving. With every movement, there are quakes as the crust literally buckles under their massive weight.
It is possible that they were used in the original terraforming of the planet millennia ago. Or perhaps they were simply an art form created by the famous eco-poet Deirdre Skye just because she could.
Assuming a vaguely conical shape:
$$V=\frac{πr^2h}{3}$$
A height of about 5,000 m;
A radius of about 5,000 m;
And a density similar to that of titanium 4500 $kg/m^3$;
$1.31×10^{11}m^3 \times 4500 kg/m^3 = 5.9\times10^{14} kg$
We get a mass of about 590 billion metric tons.
Is there any way such a machine would still be mobile?
If it is relevant to answering the previous question, feel free to address related topics such as what material it is probably build out of, how much energy it would need to move (fusion reactors?), but this is not mandatory if you can argue for a credible answer without using such estimates.
Edit: Yes, in terms of size and speed I would imagine them to be comparable to (very fast) glaciers.