Texas and New Orleans Railroad
The Texas and New Orleans Railroad (reporting mark TNO) was an American rail company in Texas and Louisiana. It operated 3,713 miles (5,975 km) of railroad in 1934; by 1961, 3,385 miles (5,448 km) remained when it merged with parent company Southern Pacific (SP).
Source: Wikipedia — Texas and New Orleans Railroad (CC BY-SA 4.0)