In 1931 two embankments were built.
 A long, shallow one alongside the down Bristol line between Durston railway station and Cogload; and a shorter, steeper one alongside the down Castle Cary line to bring trains back to ground level before the line passes beneath the road bridge at Charlton, a short distance east of the junction.
 Between the two embankments is a large steel Warren truss girder bridge.

The two trusses are asymmetrical and different sizes as the bridge is constructed on the skew due to the angle that the two lines make to each other.
 The larger truss is 185 feet (56.4 m) long and weighs 88 long tons (89 t); the smaller truss is 161 feet (49.1 m) and weighs 70 long tons (71 t).
 Vertical suspenders are attached to alternate cross-girders, which are spaced at 11.75 feet (3.6 m) centres.
 These support two longitudinal bearers beneath the rails, above which is a steel deck.
 The whole steelwork weighs 227 long tons (231 t).
In 1931 two embankments were built.  A long, shallow one alongside the down Bristol line between Durston railway station and Cogload; and a shorter, steeper one alongside the down Castle Cary line to bring trains back to ground level before the line passes beneath the road bridge at Charlton, a short distance east of the junction.  Between the two embankments is a large steel Warren truss girder bridge.
The two trusses are asymmetrical and different sizes as the bridge is constructed on the skew due to the angle that the two lines make to each other.  The larger truss is 185 feet (56.4 m) long and weighs 88 long tons (89 t); the smaller truss is 161 feet (49.1 m) and weighs 70 long tons (71 t).  Vertical suspenders are attached to alternate cross-girders, which are spaced at 11.75 feet (3.6 m) centres.  These support two longitudinal bearers beneath the rails, above which is a steel deck.  The whole steelwork weighs 227 long tons (231 t).
Cogload Junction