Diagram of the cross-section of railway track built to three <a href="https://en.wikipedia.org/wiki/Track_gauge" class="extiw" title="w:Track gauge">gauges</a> (1600 mm, 1435 mm and 1067 mm) in Gladstone and Peterborough, South Australia, before gauge standardisation was achieved in 1970.
<a href="//commons.wikimedia.org/wiki/User:SCHolar44" title="User:SCHolar44">SCHolar44</a>
<span class="int-own-work" lang="en">Own work</span>