  Inclusive transverse momentum spectra of charged particles in photoproduction
events in the laboratory pseudorapidity range $-1.2<\eta<1.4$ have been
measured up to $p_{T}=8\GeV $ using the ZEUS detector. Diffractive and
non--diffractive reactions have been selected with an average $\gamma p$ centre
of mass (c.m.) energy of $\langle W \rangle = 180\GeV$. For diffractive
reactions, the $p_{T}$ spectra of the photon dissociation events have been
measured in two intervals of the dissociated photon mass with mean values
$\langle M_{X} \rangle = 5$ GeV and $10$ GeV. The inclusive transverse momentum
spectra fall exponentially in the low $p_{T}$ region. The non--diffractive data
show a pronounced high $p_{T}$ tail departing from the exponential shape. The
$p_{T}$ distributions are compared to lower energy photoproduction data and to
hadron--hadron collisions at a similar c.m. energy. The data are also compared
to the results of a next--to--leading order QCD calculation.
