Sleepers are used to support what?
Track (rail transport) shimming. For this reason jointed track is not financially appropriate for heavily operated railroads. Timber sleepers are of many available timbers, and are often treated with creosote, Chromated copper arsenate, or other wood preservatives. Pre-stressed concrete sleepers are often used where timber is scarce and where tonnage or speeds are high. Steel is used in some applications. The track ballast is customarily crushed stone, and the purpose of this is to support the sleepers and allow some adjustment of their position, while allowing free drainage. A disadvantage of traditional track structures is the heavy demand for maintenance, particularly surfacing (tamping)
Sleepers, Wake! in income support and choosing to stay or leave the workforce. However, Jones noted in the 1990 edition that the Labor government did not pursue the idea of basic income when it won office in 1983. "Sleepers, Wake!" analyzes the major changes in the workforce and presents the possible political programs to assist the society in profiting from the technological advancements. The fourth edition uses 1991 Commonwealth census data as confirmation of his thesis about changes in the labour force. Barry Jones was Australia's Minister for Science in the Hawke government from 1983 to 1990. Sleepers, Wake! Sleepers, Wake! Technology