255) The nominal size of ballast used for points and crossings is

256) At points and crossings, the total number of sleepers for 1 in 12 turnouts in Broad Gauge is

257) Width of ballast section for Broad Gauge is

258) The type of spike used for fixing chairs of bull headed rails to wooden sleepers is

259) The sleepers resting directly on girder are fastened to the top fiange of girder by