Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Archaeological Site of Atapuerca' has mentioned 'Railway' in the following places:
Occurrence Sentence Text Source
Map of the railway trench with discovery sites
The archaeological significance of the area became increasingly apparent during the construction of a railway line as deep trenches were cut through the rocks and sediments of the Gran Dolina site, the Galerxc3xada Elefante and at Sima de los Huesos.
Location of the excavation sites in the railway ditch (after the visible protective roofs): (1) Entrance to the ditch; (2) Sima del Elefante; (3) Galerxc3xada; (4) Gran Dolina
All are all cave sites, and it is a railway cutting that initially exposed some of them.