Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Semmering Railway' has mentioned 'Construction' in the following places:
Occurrence Sentence Text Source
It is commonly referred to as the world's first true mountain railway, given the very difficult terrain and the considerable altitude difference that was mastered during its construction.
The construction features 14 tunnels (among them the 1,431 m summit tunnel), 16 viaducts (several two-storey) and over 100 stone arch bridges and 11 small iron bridges.
Across an overall track length of 41xc2xa0km the Semmering railway overcomes an altitude difference of 460 m; on 60% of its length the gradient is 2.0-2.5% (equivalent to a 1-meter difference in altitude on a 40 m route distance) and 16% exhibit a curvature radius of only 190 m. This was an entirely new technical dimension of railway construction, and new instruments and methods of surveying had to be developed to handle the resulting challenges.
On April 25, 2012 ground was broken for the construction of the 27.3xc2xa0km Semmering base tunnel.
Set against a spectacular mountain landscape, the railway line remains in use today thanks to the quality of its tunnels, viaducts, and other works, and has led to the construction of many recreational buildings along its tracks.
Criterion (ii): The Semmering Railway represents an outstanding technological solution to a major physical problem in the construction of early railways.
Criterion (iv): With the construction of the Semmering Railway, areas of great natural beauty became more easily accessible and as a result these were developed for residential as well recreational use, creating a new form of landscape.