Lubrication of Moving Parts of Vehicles.

There is no doubt that bogie centres and side bearers, horn cheeks, etc., should be well lubricated, but the claim that absence of lubrication does cause a derailment has not been proven, though, of course, lubrication does decrease the resistance to traction on curves and renders derailment less likely. It is principally on traversing curves that the benefit of lubricating the side bearers is felt.