Lifespan of ties

From: "SK Jagasia" skjagasia@patilgroup.com

Request you to help in getting these answers please:

1.0 How the calculate life of Wooden ties laid under rail with respect to Gross Million ton pass?

2.0 What is expected Life of a steel channel ties / composite ties life?

3.0 Life of steel channel ties with respect to Pre stress concrete ties over same Gross Million ton pass?

S K Jagasia
Vice President - Composite Sleeper
Patil Rail Infrastructure Pvt Ltd.
Secunderabad, India