The “4S” designation refers to four advantages of the new MONORAIL MR carriages and stands for:
- Serviceability – Compatible with the previous generation, cross wiper easily replaced by pulling over the rails, and front plate attachment with four screws.
- Supply of Lubricant: Use-driven lubricant distribution, pressure tight lubrication channels, and lubrication in idle. Front plate configured for individual track lubrication, visible from outside.
- Shock resistant: Carriage body optimized for rigidity.
- Soil repellent: Rugged stainless steel front plate with secure attachment, double-lip back-supported cross wiper with extended service life under adverse environmental conditions.