Some older photos

First photo shows the ECML bridge furthest away and the Bedford branch line nearest to the camera.  This was taken in 1964 not long after final closure of the line.  The track was still in place.  The lines shared an embankment at this point  but the bridges were separate as the branch line was at a lower level.  Shortly after this, the Bedford line parted from the main line as it continued north west while the main line curved north .  This is the point where the viaduct that will carry the Cambridge bound line over the main line starts.
 
The second photo shows the main line bridge and the abutments of the Bedford line bridge in 2005.  The E and S Metals (Sita) scrap yard is being forced to close because of the rail works.  Where the two lines parted, there was a triangle of land cut off by the railway.  In the 1980's this was used as a "landfill" site for waste even though this was the natural level of the ground.   The triangle is level to the top of the Bedford line embankment which has effectively disappeared and a bit below the main line embankment.  The viaduct will have to cross this ground and presumably will cause them a few problems.