Calgary Transit has been investigating ways to reduce the environmental impact of operating the Light Rail Transportation (LRT) system.

Grease is applied to the wheels of a train before it enters curves on the track system. This is done to reduce wear on wheels and rails and reduce the noise level. When grease is applied to the wheels, some of it is released to the track and the surrounding area.

Special grease mats are designed to capture excess grease while allowing the water to pass through. The mats also have the added benefit of reducing maintenance by allowing easier cleanup.

This is one control measure Calgary Transit has initiated to reduce its potential impact on the environment.