Four rail vehicles at the <a href="https://en.wikipedia.org/wiki/Danbury_Railway_Museum" class="extiw" title="w:Danbury Railway Museum">Danbury Railway Museum</a> in Danbury, Connecticut from left to right; 
<ul><li>New York, New Haven and Hartford Railroad Budd RDC-1 Number 32,</li>
<li>Penn Central Railroad Class N-8A Caboose number 23662,</li>
<li>New York, New Haven and Hartford Railroad (later Metro-North Railroad)  Pullman-Standard 4400-series "Washboard" car number 4671,</li>
<li>and a Sperry Rail Service Detector Car, <s>possibly</s> SRS 135.</li></ul>
<a href="//commons.wikimedia.org/wiki/User:DanTD" title="User:DanTD">DanTD</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>