Graph showing the method of calculating track gradient.
<a href="//commons.wikimedia.org/wiki/User:Z22" title="User:Z22">Z22</a>
2012-11-18 17:16:31
<span class="int-own-work" lang="en">Own work</span> This is a derived work of <a href="//commons.wikimedia.org/wiki/File:Grade_dimension.svg" title="File:Grade dimension.svg">Grade dimension.svg</a> and <a href="//commons.wikimedia.org/wiki/File:Higher_speed_loco_ca_us.svg" title="File:Higher speed loco ca us.svg">Higher speed loco ca us.svg</a> which are in the public domain.