I want to know the answer to the following question:
How long is the tunnel connecting Lotschberg and Gotthard planned to be?
All the background I'm provided with is that "Moreover, plans are underway to build a 57 km (35 mi)-long sub-alpine tunnel connecting the older Lötschberg and Gotthard tunnels built in the 19th century.". Is that enough to answer the question?
Answer: yes