The Ras al Naqab station of the Hejaz Railway was built in the 1930's in order to transfer potash from rail cars to trucks.

These trucks then transported the phosphate over the Naqab Escarpment to Dabat Hannout some 3000 feet below. From there the trucks traveled via Humeima to Aqaba where the phosphate was loaded onto ships for export.

The Ma'an to Ras al Naqab line was abandoned in the 1970's when the mining companies constructed a new train line that passed around the end of the Naqab escarpment and back through Wadi Rum and then into Aqaba. The rail lines to Naqab were then removed, but the platform and storage facilities remain in Ras al Naqab to this day. Today Ras al Naqab is a sleepy Jordanian desert village. The old haj that runs the local store still remembers the hey-days of Naqab. The Government Rest House and Police Station have been taken over by the AnNour Clinic for Chest Diseases. Visitors are welcome to drive up to the clinic and photograph the view over the edge of the cliff. As you can see, the 3000 foot drop made it impossible for a rail line to go farther.

Source: Nabatea Net - http://nabataea.net/naqab.html