Termites love Karri so makes sense it was powellised - probably also used as crossing timbers given size of Karri trees and timber. Unsure why they would have used Stringy Bark though, let alone from Tasmania! Quite a low durability rating for in ground applications. Even Jarrah isn't a top tier choice but obviously the availability of it in WA made it suitable.
Fact 36 / 100 – Durability of Sleepers
The total number of sleepers used for the Trans-Australian Railway were as follows:
Jarrah (Western Australia) 1,985,000
Powellised Karri (Western Australia) 454,000
Stringy Bark (Tasmania) 100,000
The numbers vary widely from the original contract which stated the main source of sleepers would be Karri. However the Karri sleepers were proving to be the most durable with only small numbers being replaced whereas the Jarrah and especially the Stringy Bark seemed less efficient.
Edited 16 Jun 2017 12:42, 4 years ago, edited by simont141
Termites love Karri so makes sense it was powellised - probably crossing timbers given size of Karri trees and timber. Unsure why they would have used Stringy Bark though, let alone from Tasmania! Quite a low durability rating for in ground applications. Even Jarrah isn't a top tier choice but obviously the availability of it in WA made it suitable.
Fact 36 / 100 – Durability of Sleepers
The total number of sleepers used for the Trans-Australian Railway were as follows:
Jarrah (Western Australia) 1,985,000
Powellised Karri (Western Australia) 454,000
Stringy Bark (Tasmania) 100,000
The numbers vary widely from the original contract which stated the main source of sleepers would be Karri. However the Karri sleepers were proving to be the most durable with only small numbers being replaced whereas the Jarrah and especially the Stringy Bark seemed less efficient.
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