Logo of the <a href="https://en.wikipedia.org/wiki/Massachusetts_Bay_Transportation_Authority#History" class="extiw" title="w:Massachusetts Bay Transportation Authority">Metropolitan Transit Authority</a> of Boston, the predecessor of the modern <a href="https://en.wikipedia.org/wiki/Massachusetts_Bay_Transportation_Authority" class="extiw" title="w:Massachusetts Bay Transportation Authority">Massachusetts Bay Transportation Authority</a>.
<a href="//commons.wikimedia.org/wiki/User:Simtropolitan" title="User:Simtropolitan">Simtropolitan</a>, original unknown
<a rel="nofollow" class="external text" href="https://archive.org/stream/annualreportofb1947metr_0#page/n285/mode/1up">The First Annual Report of the Board of Public Trustees of the Metropolitan Transit Authority7</a>, colors from replicas seen on the <a href="https://en.wikipedia.org/wiki/Ashmont%E2%80%93Mattapan_High_Speed_Line" class="extiw" title="w:Ashmont–Mattapan High Speed Line">Ashmont–Mattapan High Speed Line</a>