Bajoran wormhole schematic
The FTR pipeline was a channel in the Bajoran wormhole. The pipeline began from a curve known as F1 and ended at the terminus of the wormhole in the Gamma Quadrant.
On the chart "A Tunnel in the Sky", which was seen in the schoolroom aboard Deep Space 9 in 2369, the FTR pipeline was one of the components labeled on a map of the Bajoran wormhole. (DS9: "In the Hands of the Prophets")