Tunnel 24 was bored in 1878, and carried the CNO&TP/CS through the mountain at Nemo, Tennessee. A small depot was located south of the south portal. Beside the depot, was a switch to the Morgan & Fentress Railroad. On top of the portal once stood two homes. There was also a height brush about 1000ft from the portal, to warn any brakemen on top of the cars (a 1800's practice) that there was a low clearance approaching. Today, all of the above listed are gone. The homes, depot, and M&F Railroad are all gone. M&F's tracks were pulled after a 1949 flood destroyed their bridge over the Emory River. In 1963 CNO&TP successor and lease holder Southern Railway began moving forward with plans to eliminate, bypass or raise the remaining 10+ tunnels on the CNO&TP. Due to increasing rail car height, the 15X20 measurements were not generous enough and posed restrictions on shipments on this vital rail corridor. Plans were drawn up to bypass 24, and Nemo sister tunnels 23 and 22 with two new tunnels. The alignment of such may be viewed on the Google Map. The new tunnels are 20X30, much larger than the old tunnels. Today, the tunnel sits empty beside the new 24, which Southern Railway successor and lease holder Norfolk Southern uses daily. It is almost completely intact, with minor damage being a collapsed, but cleared, north portal. The interior sees minor water buildup on the south end, however dries out half way through. For years off roaders have enjoyed the tunnel, and it is quite neat to explore if you're a history buff. The current owner of the tunnel is not known, as Norfolk Southern has the current tracks well over 700 feet from this tunnel, however some are not sure if it was possible for Southern to get rid of a tunnel the City owns.