This is a <a href="https://en.wikipedia.org/wiki/Burlington_Northern_Railroad" class="extiw" title="w:Burlington Northern Railroad">Burlington Northern Railroad</a> logo from April 1970. Scanned from BN Form 6017, Stock 470-300M Time Table and traced in Adobe Illustrator CC 2017.
Burlington Northern Santa Fe (BNSF Railway), successor
BN Form 3017; Stock 470-300M; Scanned; Traced in Adobe Illustrator