The SideTracked cache series was started in 2007 when the first cache was placed at Evesham station in Worcestershire, and has since spread all across the UK (and beyond!). More can be found at the SideTracked Series website. There is currently a SideTracked cache not may metres from the event.
We hosted one event last year and wanted to host another this year. I will be in the Car park waiting to see who can make it along. This is a lovely little station that I pass now and again and worth a visit.