Union Pacific 4014
... that Union Pacific 4014 has been the only Big Boy locomotive operating in the United States since 2019?
... that <b id="mwCKA"><a href="./Union_Pacific_4014" id="mwCKE" rel="mw:WikiLink" title="Union Pacific 4014">Union Pacific<span id="mwCKI" typeof="mw:Entity"> </span>4014</a></b> <i id="mwCKM">(pictured)</i> has been the only <a href="./Union_Pacific_Big_Boy" id="mwCKQ" rel="mw:WikiLink" title="Union Pacific Big Boy">Big Boy</a> locomotive operating in the United States since 2019?