Occurrence of Attributes in Original Text
The text related to the cultural heritage 'Trans-Iranian Railway' has mentioned 'Tunnel' in the following places:
| Occurrence Sentence | Text Source |
|---|---|
| A tunnel through a salt dome was abandoned because the disrupted water table would erode away the salt. | WIKI |
| A tunnel started through apparently solid rock was abandoned after it encountered powdery gypsum that filled the excavation as quickly as it was dug out. | WIKI |
| A tunnel through pumice could not be blasted and could not be dug as the picks and shovels became stuck. | WIKI |
| A tunnel encountered a large "void" or cavern in the mountain that required a bridge within the tunnel. | WIKI |