The Gray Sisters' Taxi is a taxi that operates in Greater New York. It is summoned by saying a "Stêthi 'Ô hárma diabolês" (translated as "Stop, Chariot of Damnation") and throwing a golden Drachma in the road. It is said to be the fastest mode of transportation to camp, as the drivers don't care how fast they're going. It is driven by the Gray Sisters.
The Gray Sisters' Taxi appears to be woven out of smoke. Instead of seat belts, there are black chains