Rail & Locomotive Lubricants

Supporting Rolling Stock and Rail Infrastructure

Rail equipment must operate reliably over long distances, demanding schedules and widely changing environmental conditions.

Rock Oil products are designed to help:

• Protect components against wear and corrosion.
• Maintain performance under sustained and shock loading.
• Support equipment operating across changing temperatures.
• Resist oxidation, contamination and lubricant breakdown.
• Maintain cleaner engines, hydraulic systems and gear units.
• Reduce avoidable maintenance and downtime.
• Support both rolling stock and associated depot or trackside machinery.

Diesel Engine Lubricants

Diesel locomotives, multiple units and rail-support equipment require engine oils capable of protecting heavily loaded engines during prolonged operation.

Rock Oil’s heavy-duty diesel lubricant portfolio includes mineral, semi-synthetic and fully synthetic technologies for different engine generations and emissions requirements.

Available products support:

• Wear and deposit control.
• Oxidation resistance.
• Soot management and engine cleanliness.
• Protection during prolonged high-load operation.
• Modern exhaust after-treatment systems.
• Older and mixed-age equipment fleets.
• Extended servicing where permitted by the equipment manufacturer.

The TRUCK-GUARD® range includes products aligned with major heavy-duty diesel engine specifications, including requirements associated with manufacturers such as MTU, Cummins, Caterpillar and other engine builders used across transport and industrial applications. Suitability must always be confirmed against the individual locomotive or engine specification.

Hydraulic Systems

Hydraulic equipment is used throughout the rail sector, from braking and suspension-related systems to lifting equipment, maintenance machinery and trackside operations.

Rock Oil’s ULTRA-HYD range includes:

• Premium mineral hydraulic fluids.
• High-viscosity-index products.
• Long-life hydraulic lubricants.
• Synthetic fluids.
• Zinc-free options.
• Detergent hydraulic oils.
• Biodegradable and fire-resistant formulations.

High-viscosity-index fluids are particularly relevant where equipment must start reliably in cold conditions before operating under sustained load and higher working temperatures.

The wider range allows hydraulic lubricants to be matched to different pressures, system designs, temperature ranges and operating environments.

Gearboxes and Drive Systems

Rail gearboxes and mechanical drive systems operate under combinations of high torque, vibration and changing speeds.

Rock Oil’s INDUS-GEAR™ range provides mineral and synthetic lubricants for enclosed gear systems, alongside products for exposed and heavily loaded components.

The range is developed to support:

• Gear and bearing protection.
• Resistance to wear and micropitting.
• Reliable operation under heavy and shock loads.
• Oxidation and thermal stability.
• Corrosion protection.
• Foam control and air release.
• Longer lubricant life in suitable applications.

Different technologies are available for conventional gear systems, severe operating environments, high temperatures and environmentally sensitive locations.

Coolants and Antifreeze

Rail engines and auxiliary systems depend on effective cooling to maintain operating temperatures and protect against freezing, overheating and corrosion.

The KOOL-GUARD range includes several coolant technologies, including conventional, organic-acid, hybrid and heavy-duty formulations.

Products are available in concentrated and ready-to-use forms, with options developed to help:

• Maintain efficient heat transfer.
• Protect ferrous and non-ferrous metals.
• Prevent freezing and overheating.
• Reduce corrosion and deposit formation.
• Support extended coolant life where suitable.
• Meet the requirements of different engine and equipment manufacturers.

Selected KOOL-GUARD formulations include the British Rail BR637 requirement, alongside broader heavy-duty engine and industrial coolant standards. The correct product should always be matched to the equipment manufacturer’s specified chemistry and performance level.

Compressor and Auxiliary Equipment Lubricants

Compressed-air systems and auxiliary equipment support a variety of rail functions and depot operations.

Rock Oil’s COMPRESSOR-GUARD™ range provides lubricants for rotary screw, reciprocating and vane compressors, with mineral and synthetic options available for different duty cycles.

These products are developed to support:

• System cleanliness.
• Resistance to oxidation and deposits.
• Wear and corrosion protection.
• Low lubricant volatility.
• Reliable continuous operation.
• Longer maintenance intervals where suitable.

The broader Turbine and Compressor Oils range also includes specialist fluids for vacuum pumps and other continuously operating industrial equipment.

Greases for Rail Applications

Greases are used across rolling stock, workshop equipment and rail infrastructure, including bearings, pins, bushes, linkages and other heavily loaded components.

Rock Oil supplies greases developed to provide:

• High load-carrying performance.
• Protection against wear and shock loading.
• Resistance to water and corrosion.
• Strong adhesion.
• Stability across changing temperatures.
• Reliable performance during prolonged operation.

The correct grease should be selected according to the component, speed, load, temperature, sealing arrangement and existing lubricant technology.

Compatibility must also be considered carefully when changing from one grease type to another.

Rail Infrastructure and Maintenance Equipment

Rock Oil products can also support machinery used in rail maintenance and infrastructure operations.

Applications can include:

• Track-maintenance machinery.
• Lifting and access equipment.
• Depot machinery.
• Generators and auxiliary power equipment.
• Hydraulic tools and systems.
• Workshop compressors.
• Materials-handling machinery.
• Service and support vehicles.

This broader product coverage allows maintenance teams to source lubricants for both rolling stock and the equipment used to keep the network operational.

Aerosols and Maintenance Products

Rock Oil’s aerosol range provides practical support for depots, workshops and mobile maintenance teams.

Available products support:

• Cleaning and degreasing.
• Penetrating seized components.
• Water displacement.
• Corrosion protection.
• Anti-seize applications.
• Lubrication of chains, cables and linkages.
• Cleaning electrical components.
• Routine preventative maintenance.

These products help technicians maintain exposed components, free difficult fasteners and protect equipment during servicing or storage.

Operating in Challenging Conditions

Rail equipment can be exposed to cold starts, high operating temperatures, water, dirt, brake dust and other environmental contamination.

Suitable lubrication helps support:

• Reliable start-up in low temperatures.
• Stable fluid performance once equipment reaches operating temperature.
• Protection against rust and moisture.
• Resistance to contamination and deposit formation.
• Lubricant-film strength under heavy loading.
• Dependable operation over long distances and extended duty cycles.

Product selection should reflect the equipment design, route, climate, loading and servicing arrangements.

Supporting Passenger, Freight and Specialist Operations

Passenger Rail

Lubricants and coolants help support reliable operation across diesel-powered passenger services, depot equipment and auxiliary systems.

Freight and Heavy Haulage

Heavy loads and extended journeys place particular pressure on engines, gear systems and mechanical components.

Shunting and Depot Operations

Frequent starts, stops and low-speed operation can create different lubrication challenges from long-distance running.

Rail Infrastructure

Hydraulic fluids, greases and maintenance products support equipment used for track work, lifting, inspection and network maintenance.

Heritage Rail

Rock Oil’s wider portfolio includes lubricant technologies for older engines and machinery where more traditional formulations may be required.

Lubricant Selection and Condition Monitoring

Rail fleets can include equipment from different manufacturers, generations and operating environments.

A structured lubrication review can help identify:

• The correct products for each system.
• Opportunities to rationalise lubricants safely.
• Risks caused by incorrect or incompatible products.
• Suitable service intervals.
• Areas where contamination control can be improved.
• Opportunities for condition monitoring and oil analysis.

Oil analysis can help monitor lubricant condition, wear metals, viscosity, contamination and oxidation, providing useful information for maintenance planning.

Any extension of service intervals should be supported by the equipment manufacturer and reliable condition-monitoring data.

Supporting Efficient Rail Operations

Correct lubrication can contribute to operational efficiency by reducing friction, controlling wear and maintaining clean, responsive systems.

Depending on the application, suitable products can help support:

• Reliable equipment availability.
• Reduced component wear.
• Longer lubricant life.
• Fewer maintenance interventions.
• Stable hydraulic and gear-system performance.
• Reduced risk of unplanned stoppages.
• More efficient maintenance planning.

Performance benefits will depend on equipment condition, operating duty, environment and servicing practices.