Resolves as YES if there is strong evidence that an operational passenger vactrain provides service between Riyadh and Cairo before January 1st 2070.

Riyadh connections:

/Dulaman/mumbairiyadh-vactrain-by-2070
/Dulaman/riyadhcairo-vactrain-by-2070 (this question)

To count, all of the following must be true:

• Operational passenger service (not a stunt): The system must carry paying passengers (or passengers traveling under a publicly offered ticketing program) from the Riyadh terminal to the Cairo terminal, and it must do so on at least two separate calendar days (to rule out a one‑off ceremonial ride).

• Riyadh endpoint: A passenger terminal/station located within Riyadh greater metropolitan area.

• Cairo endpoint: A passenger terminal/station located within Cairo greater metropolitan area.

• One continuous fixed guideway: The passenger trip must be possible on a continuous, fixed, physical guideway (tube/tunnel/structure). It cannot rely on aircraft, ships, or an “open ocean” segment.

• Vactrain requirement: The core vehicle must travel inside a sealed tube explicitly described by the operator/regulators/credible technical coverage as low‑pressure / near‑vacuum for the transatlantic portion (i.e., it’s not simply high‑speed rail in open air). For the purposes of this question, the average air pressure surrounding the vehicule over the duration of the journey must not exceed 0.1 bar.

• Direct Riyadh ↔ Cairo passenger journey: The service may include intermediate stops, but passengers must be able to travel from Riyadh to Cairo as a single offered journey without switching to a different transportation mode.
  
  

“Strong evidence” means at least two independent, reputable sources (e.g., major news outlets, national transport regulators, or official operator documentation with corroborating third‑party reporting) clearly indicate the above criteria were met before the deadline.

Resolves as NO if the above does not occur before January 1st 2070, including if:

• only cargo service exists,

• only test runs occur,

• a system operates but does not reach both endpoint cities as defined,

• or the first qualifying passenger operation begins on/after January 1st 2070.