  Results are presented on event-by-event fluctuations in transverse momentum
of charged particles, produced at forward rapidities in p+p, C+C, Si+Si and
Pb+Pb collisions at 158 AGeV. Three different characteristics are discussed:
the average transverse momentum of the event, the Phi_pT fluctuation measure
and two-particle transverse momentum correlations. In the kinematic region
explored, the dynamical fluctuations are found to be small. However, a
significant system size dependence of Phi_pT is observed, with the largest
value measured in peripheral Pb+Pb interactions. The data are compared with
predictions of several models.
