There is a daily spoil train which goes to the landfill at Calvert via the Chiltern Line. I think it carries a lot of the "cleaned soil" from Powerday which originates from the Olympic works around Hackney and Stratford. The train is usually headed by an EWS class 60 / 59.
Wow, that surprises me. From my observations of the construction going on down there I would have said that the Olympic Park is a net user of spoil rather than a producer of surplus.
The ground level across the entire site covering both the former Stratford Diesel depot, Freightliner yard, parts of Leyton between the old "Railway Lands" and the A12, and now the site of the Thornton Fields carriage sidings has been raised massively to the extent that all the railway lines that still run across the site are now run in tunnels. To achieve this has required massive amounts of soil being brought into the site, heaped up and compacted.
I was shocked to see an old shot of the High Meads loop showing the line running on the flat down the side of the Freightliner yard. When I learned it the loop had become a steep-sided cutting. Now it's been roofed over and become a tunnel just like all the other lines crossing the site. As another example,
this view of the of the approaches to the former Stratford Low Level platforms from the top of the subway onto P12 is no longer possible. I'll try and get a shot of the current view from the same spot and angle if possible when I'm there again later today, but I can tell you now that it will probably just show the underframe equipment of a Cl313 or Cl378, the platform and the massive Westfield shopping complex being built on top.
O L Leigh