All truss have single coat of factory applied truss finish paint. You can have a second coat. Or sandblast prime and finish. To prevent truss from getting rusty

perpendicular to the incline or perpendicular to the finish floor

Literally the handrails.

Sheet steel with black anti-friction, stainless steal with black, stainless with clear. Vertical surface with skirt brushes on it.

Design-E&F (stainless, powder coated aluminum, custom color powder coat), Design-I (N/A)

Design-E (Glass), Design-F (Glass or Stainless), Design-I (Stainless)

Design E- Slimline stainless steel. Design-F – Powder coated extruded aluminum, Design-I (High-Deck stainless steel)

Design E, Design F, Design I (incline) – general external shape of the escalator above the step level. Design-E & F (Vertical panels), Design-I (Inclined away from passenger)