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About 70% of the total length is made up of double-track and multi-track lines, specialized for freight and passenger traffic.
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1. Is About 70% of the total length made up of double-track and multi-track lines?

2. How many percent of the total length is made up of double-track and multitrack lines?

3. Is About 70% of the total length made up of double-track or multi-track lines?

Или Is 70% of the total length specialized for freight or passenger traffic

4. What is specialized for freight and passenger traffic?