  We calculate next-to-next-to-leading order soft-gluon corrections to top
quark total and differential cross sections in hadron colliders. We increase
the accuracy of our previous estimates by including additional subleading
terms, including next-to-next-to-next-to-leading-logarithmic and some virtual
terms. We show that the kinematics dependence of the cross section vanishes
near threshold and is reduced away from it. The factorization and
renormalization scale dependence of the cross section is also greatly reduced.
We present results for the top quark total cross sections and transverse
momentum distributions at the Tevatron and the LHC.
