These two-car trains were used to collect subway fares until 2006.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/40407485@N06">Justin Nelson</a>
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/plattypus_of_new_york/3715053466/">Money Train</a>