  A measurement of the W mass and width has been performed by the DELPHI
collaboration using the data collected during 1998. The data sample has an
integrated luminosity of 155 pb^{-1} and an average centre-of-mass energy of
188.6 GeV. Results are obtained by applying the method of direct reconstruction
of the mass of the W from its decay products in both the W+W- -> lvqq and W+W-
-> qqqq channels. The W mass result for the 1998 data set is M_W = 80.387 +/-
0.087 (stat) +/- 0.034 (syst) +/- 0.017 (LEP) +/- 0.035 (FSI) GeV/c2, where FSI
represents the uncertainty due to final state interaction effects in the qqqq
channel, and LEP represents that arising from the knowledge of the beam energy
of the accelerator. Combining this result with those previously published by
the DELPHI collaboration gives the result M_W = 80.359 +/- 0.074 (stat) +/-
0.032 (syst) +/- 0.017 (LEP) +/- 0.033 (FSI) GeV/c2. The combined value for the
W width is \Gamma_W = 2.266 +/- 0.176 (stat) +/- 0.056 (syst) +/- 0.052 (FSI)
GeV/c2.
