Reading STEP TRIMMED_CURVE

Hi,

I used the STEPControl_Reader to read a step file that contains (among others), some TRIMMED_CURVE curves.
When I loop over the shapes with a ShapeExtend_Explorer, i get the shape has type TopAbs_EDGE. But when I then do

TopoDS_Edge edge = TopoDS::Edge(shape);
Standard_Real first, second;
BRep_Tool::Curve(edge, first, second)

then the resulting curve turns out to be of type STANDARD_TYPE(Geom_Line) instead of STANDARD_TYPE(Geom_TrimmedCurve). With that, I am a bit confused on whether I am doing something wrong, or is there a way I can get the (trimmed) start and endpoint for a Geom_Line (which is infinite as I understand it).

In addition, I am trying to figure out how to use the STEP reader to get additional info like product and shape names from it. Any documenation pointers would be welcome.

Thx!
Broes