see image title - first number is figure or diagram number. See list of illustrations in source ( <a rel="nofollow" class="external free" href="https://archive.org/stream/electricrailwaye01pars#page/n11/mode/2up">https://archive.org/stream/electricrailwaye01pars#page/n11/mode/2up</a> ) for page number in source - relevent text content is near to image in the source
Unknown author<span style="display: none;">Unknown author</span>
2012-08-28 03:14:51
"Electric railway engineering" by H. F. Parshall and H. M. Hobart. Published 1907. See <a rel="nofollow" class="external free" href="http://openlibrary.org/books/OL23297005M/Electric_railway_engineering">http://openlibrary.org/books/OL23297005M/Electric_railway_engineering</a> . Sources is - <a rel="nofollow" class="external free" href="https://archive.org/details/electricrailwaye01pars">https://archive.org/details/electricrailwaye01pars</a>