A turbine engine comprising: a fan shaft; at least one tapered bearing mounted on the fan shaft, the fan shaft including at least one radially extending passage adjacent the at least one tapered bearing; a fan mounted for rotation on the tapered bearing; and an epicyclic gear train coupled to drive the fan, the epicyclic gear train including a carrier, supporting star gears that mesh with a sun gear, and a ring gear surrounding and meshing with the star gears, characterised in that each of the star gears is supported on a respective journal bearing, wherein the epicyclic gear train defines a gear reduction ratio of greater than or equal to 2.3, the fan shaft is coupled to the ring gear, the ring gear is a two-piece construction having first and second portions (40, 42) that abut each other at a radial interface, a trough separates oppositely angled teeth on each of the first and second portions (40, 42), the first and second portions (40, 42) include flanges that extend radially outward away from the teeth, the fan shaft includes a radially outwardly extending flange that is secured to the flanges by circumferentially arranged bolts and nuts, an oil baffle is secured to the flanges (51, 70), knife edge seals are secured to the flanges of the first and second portions (40, 42), the first and second portions (40, 42) have grooves at the radial interface that form a hole for expelling oil through the ring gear to a gutter secured to the carrier, and the seals include oil return passages provided by first and second slots in the seals to permit oil on either side of the ring gear to drain into the gutter. a fan shaft; at least one tapered bearing mounted on the fan shaft, the fan shaft including at least one radially extending passage adjacent the at least one tapered bearing; a fan mounted for rotation on the tapered bearing; and an epicyclic gear train coupled to drive the fan, the epicyclic gear train including a carrier, supporting star gears that mesh with a sun gear, and a ring gear surrounding and meshing with the star gears, characterised in that each of the star gears is supported on a respective journal bearing, wherein the epicyclic gear train defines a gear reduction ratio of greater than or equal to 2.3, the fan shaft is coupled to the ring gear, the ring gear is a two-piece construction having first and second portions (40, 42) that abut each other at a radial interface, a trough separates oppositely angled teeth on each of the first and second portions (40, 42), the first and second portions (40, 42) include flanges that extend radially outward away from the teeth, the fan shaft includes a radially outwardly extending flange that is secured to the flanges by circumferentially arranged bolts and nuts, an oil baffle is secured to the flanges (51, 70), knife edge seals are secured to the flanges of the first and second portions (40, 42), the first and second portions (40, 42) have grooves at the radial interface that form a hole for expelling oil through the ring gear to a gutter secured to the carrier, and the seals include oil return passages provided by first and second slots in the seals to permit oil on either side of the ring gear to drain into the gutter.