29 Oct '13, 6pm
Here's more info about low rail adhesion and what we're doing to try and reduce it
We know that Metro customers get hugely frustrated by delays to Metro services, especially when that is caused by low rail adhesion as a result of leaf fall. Below is a detailed examination of the issues and why the impact of autumn can hamper train services. It is a national problem that affects train companies across the UK. When leaves fall on to the line, particularly in damp or wet weather, the rolling action of passing wheels compresses them, causing a greasy ‘mulch’ to cover the rail. This mulch is to rails what ice is to roads. It reduces the adhesion, or ‘co-efficient of friction’ to use the technical term, between wheel and rail. Acceleration must be reduced to prevent the wheel from slipping, and braking distances extended. If you’re a regular Metro customer, you can probably sense the wheel “slipping” on a train if you’re travelling through an area that’s affec...