Not being an expert on trains I had a look on google maps to see where this missing curve was. This link shows what I think is the missing bit.
Todmorden - Google Maps
The track at the top of the picture curves to the right and you can see, if you zoom in a bit, where the track curves to the left disapears into the trees. It can just be seen where it used to join to the track in the bottom left of the picture.
Its hard to understand why this track was ever removed with it being so short a section.