According to historical records (and urban Myths) there is a wood burning steam locomotive from the mid 1800s buried in the sealed up portion of the Atlantic Avenue Tunnel.  For those skeptics out there who think it's unlikely that we'll find a buried steam locomotive in the sealed up portion of Atlantic Avenue Tunnel, here is some suggested reading.
Pic of Steam Shovel & Halfway Buried Locomotive	The Cotton Belt Star Webpage (NC) AP News: Buried Locomotive Discovered(NC) The Curious Case of the Buried Locomotives—or Railroad Archeology with a Vengeance (AK) (PDF) Richmond's Buried Train: The Death and Possible Resurrection of Church Hill Tunnel's Locomotive 231 (VA)