Rail & chain lubricants

Lubricants that stay out on the route

This category gathers total-loss products: they are applied, do their job, and stay where they were put. That changes the criteria compared with any closed system. On the railway, wheel-flange grease reduces curve wear and noise, but if it migrates onto the running surface it cuts adhesion exactly where braking happens: so quantity and application point matter as much as formulation. On chains the problem is the opposite: the lubricant has to penetrate the joint, between pin and bush, where the real wear happens, and then resist being flung off. And on wire ropes, the oil has to pass between the strands to the core, where corrosion starts unseen.

Types and selection criteria

Wheel-flange and curve greases are chosen on operating temperature, tackiness and whether biodegradability is required; in tunnels and urban crossings biodegradable formulations are used, because the product ends up in stormwater. Top-of-rail friction modifiers are a completely separate category: their job is to bring friction into a controlled range, not to reduce it, and they do not substitute for flange grease. Chain lubricants divide by temperature: solvent-carried penetrating oils for ordinary conveyor chains, and residue-free synthetics for ovens and dryers, where a mineral oil would leave coke in the joint. Wire-rope greases are tacky products, often applied warm, with strong corrosion protection.

Mistakes with consequences

Two of these touch safety, not just cost:

• Flange grease applied in excess or from the wrong point: it reaches the running surface and cuts braking adhesion.
• A top-of-rail friction modifier confused with wheel-flange grease: they are products with opposite jobs.
• Mineral lubricant used on oven chains: it cokes in the joint, and the chain elongates in exactly the place that cannot be cleaned.
• A chain lubricated on the outside, on the plates, instead of in the joint. Oil that never reaches between pin and bush does nothing useful.
• A non-biodegradable product used in a tunnel or an urban crossing where local regulation requires otherwise.