Branchline Index [1973-05-01, 1, News, Historical, , , , , Use of radios in train operations started in the early 1940's., <table class="r-html-container"><tbody><tr><td><a href="https://www.bytownrailwaysociety.ca/phocadownload/branchline/1973/1973-05.pdf#page=1" target="_blank">Open PDF</a></td></tr></tbody></table>]