When does Urbanization occur in Age of Steam

Question

I am second in turn order, I select Urbanization. Do I place the city at the start of my build track phase or before the first person who builds track?

Answer 1

You place the new city as your first action during your Build Track phase.

On page 2 of the rules

Urbanization action:

Implemented during the Build Track phase. This action allows this player to place one of the New City tiles on a Town before they build their track.

This is from the Warfrog edition (2002). It seems the rules haven't changed much at all despite the plethora of editions.