A <a href="https://en.wikipedia.org/wiki/Commonwealth_Railways_CB_class_railcar" class="extiw" title="w:Commonwealth Railways CB class railcar">Commonwealth Railways CB class railcar</a>, with a trailer car, at <a href="https://en.wikipedia.org/wiki/Port_Pirie_Junction_railway_station" class="extiw" title="w:Port Pirie Junction railway station">Port Pirie Junction railway station</a>, <a href="https://en.wikipedia.org/wiki/South_Australia" class="extiw" title="w:South Australia">South Australia</a>.  The railcar was built by the <a href="https://en.wikipedia.org/wiki/Budd_Company" class="extiw" title="w:Budd Company">Budd Company</a> of Philadelphia, Pennsylvania, US; it was a standard <a href="https://en.wikipedia.org/wiki/Budd_Rail_Diesel_Car" class="extiw" title="w:Budd Rail Diesel Car">Budd Rail Diesel Car</a> model RDC-1, one of three that entered service in March 1951. The trailer car was a second-hand product of the <a href="https://en.wikipedia.org/wiki/J._G._Brill_Company" class="extiw" title="w:J. G. Brill Company">Brill Company</a> purchased from the <a href="https://en.wikipedia.org/wiki/Reading_Company" class="extiw" title="w:Reading Company">Reading Railroad</a> at the same time.<p>This is one of a number of images in the collection of the State Library of South Australia depicting <a href="https://en.wikipedia.org/wiki/Commonwealth_Railways" class="extiw" title="w:Commonwealth Railways">Commonwealth Railways</a> rolling stock said to have been taken about 1951.</p><p>Some of the information provided here about the image is obtained from Fluck, Ronald E; Marshall, Barry; Wilson, John (1996). <i>Locomotives and Railcars of the Commonwealth Railways</i>. Welland, SA: Gresley Publishing, pp. 118-120. <a href="//commons.wikimedia.org/wiki/Special:BookSources/0959969039" title="Special:BookSources/0959969039">ISBN 0959969039</a>.</p>
Probably <a href="https://en.wikipedia.org/wiki/Commonwealth_Railways" class="extiw" title="w:Commonwealth Railways">Commonwealth Railways</a>.
circa 1951 <div style="display: none;">date QS:P,+1951-00-00T00:00:00Z/9,P1480,Q5727902</div>
<a rel="nofollow" class="external text" href="http://images.slsa.sa.gov.au/mpcimg/59000/B58892_546.htm">State Library of South Australia, image number B 58892/546</a>.