Time was that CNO&TP train 151 (earlier, train 51)--the "Sparkplug"--was the hottest thing on the railroad. It rolled out of Cincinnati every morning behind four SD24s, with up to 130 loaded box cars of auto parts between the power and the caboose. Years later, it's just another freight train--and actually not long for the world. NS would soon drop 151 from the schedule. Here, the "Plug" rolls out of Tunnel 25 at Oakdale (after a quick crew change there) and toward Tunnel 26 (the north portal on which the photographer is standing). Tunnel 25 has the distinction of being the only one of the original 27 CNO&TP "Rat Holes" still in service (there are three other tunnels, but they were all bored in '62-'63 to bypass smaller bores). DB Tower once stood just to the left of the lead unit. It controlled the single track stretch through the two tunnels until CTC made it obsolete.