Our spinal cord is not merely a trunk line transmitting phone calls from the brain. It too thinks.
At the junction of a branch line and the trunk line, the wires must be spliced together.
They receive oil through pipeline gathering systems from production tanks and relay it to trunk line stations.
Both of them have trouble and insecurity, but also impairs the whole mechanical strength of trunk line, and results in large contact resistance of branch, weak reliability, easy heating and accident.
Length of Railways in Operation refers to the total length of the trunk line under passenger and freight transportation( including both full operation and temporary operation).
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