SmartSander
Adhesion Management

Introduction
The level of friction between wheel and rail can be significantly reduced by rust or contaminants on the railhead, particularly in damp or humid conditions.  This results in disruption to rail services as well as a substantial increase in wheel maintenance costs, station overruns and red light violations.

One of the biggest causes of low adhesion in many parts of the world is leaf fall contamination during late autumn.  The dead leaves are drawn into the wheel / rail interface and compressed to form a hard, extremely slippery contaminant.

SmartSander provides a proven and reliable adhesion solution.  It has been in operation on several fleets in the UK for a number of years, with over 1000 units in service.

Key Features
The system monitors traction and braking demand, as well as wheel slide protection and/or traction control activity.  Should low adhesion be detected, the system activates a combination of Electro-Pneumatic (EP) valves to deliver an appropriate rate of sand to the wheel/rail interface.

SmartSander is unique in its ability to deliver a variable amount of sand directly to the wheel / rail interface.  The rate at which sand is delivered is controlled according to the severity of the low adhesion encountered, train speed and brake demand.  This ensures that sufficient sand is applied to increase wheel / rail adhesion, without jeopardising the operation of track circuits or degrading ballast condition due to excessive sand application.

The system can be configured to meet customer requirements such as fine-tuning sand delivery rates or providing a manual override for the driver.  DeltaRail can provide design and installation services.

Benefits
• Minimises damage to track circuits and ballast.

• Improved punctuality.

• Reduced maintenance costs by reducing wheel damage.

Studies have shown that equipping rolling stock with SmartSander has resulted in:

• 73% reduction in wheel slip incidents.

• an average 30% reduction in delay minutes.

• a 70% reduction in station overruns.

• a 65% reduction in wheel turning for tread damage.