Technical Note – TN 003: 2018 For queries regarding this document
[email protected] www.transport.nsw.gov.au Technical Note – TN 003: 2018 Issue date: 23 August 2018 Effective date: 23 August 2018 Subject: Turnout speeds and crossing selection This technical note is issued by the Asset Standards Authority (ASA) as an update to ESC 250 Turnouts and Special Trackwork, version 4.8 to restrict the design speed through higher speed turnouts and crossovers, provide restrictions on the use of certain crossing types and correct some typographical errors. Higher speed turnouts, when used in a crossover or a reversing curve situation without transitions, can result in higher maintenance requirements and increased passenger discomfort. Swing nose and spring wing crossings are permitted to be used with tangential turnouts, but due to whole-of-life costs considerations, restrictions on their use have been expanded. The updates include amendments to Section 6.1.5 as follows: 1. Section 6.1.5 Crossings Replace the contents of Section 6.1.5 with the following: The selection of turnouts is dependent upon the criteria for crossing rates and crossing types. For crossing rate see Section 6.1.5.1 and for crossing type see Section 6.1.5.2. 1.1. Section 6.1.5.1 Selection of crossing rate The selection of the crossing rate shall be based on the geometric design of the turnout and the associated limiting speeds of the mainline and turnout roads. Turnout speeds shall be determined by applying design standards for track geometry detailed in ESC 210 Track Geometry and Stability.