Carlo algorithm using quantum mechanical rates. The high-field regime is dominated by hot optical phonon scattering for n less than or equal to 10(19) cm(-3) and by electron-plasmon emission for higher electron concentrations. Electron-electron and electron-hole binary processes do not significantly influence the transport characteristics but extend the high-energy tail and asymmetry of the electron distribution, making it more "Maxwellian." The results demonstrate the possibility of achieving quasiballistic transport in thin diamond films with a significant portion of the held energy imparted to the electrons at high fields (F approximate to 10(18) V/mu m) and electron concentrations up to n approximate to 10(18) cm(-3).