NTSB Board Member Robert Sumwalt points to the accident scene of the Metro North train collision in Valhalla, N.Y.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/68618467@N03">National Transportation Safety Board</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/ntsb/16431211226/">NTSB Board Member Robert Sumwalt points to the accident scene of the Metro North train collision in Valhalla, N.Y</a>