<p>Detail of Big Boy No. 4012 illuminated number board and bell</p>
<p>Detail of Big Boy No. 4012 number board and bell</p>
<ul><li>Keywords: steamtown NHS; 4012; uprr big boy 4012; uprr; big boy; train; steamtown; locomotive; big boy 4012; union pacific</li></ul>
NPS Photo
Taken on 5 May 2021
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