Ügyes, bár azt nem is gondoltam, hogy az eredetileg lefektetett vágányokon folyik a forgalom még ma is. Sokkal inkább arra utaltam, hogy nem várják meg míg olyan állapotba kerül a pálya, hogy mindent egyszerre kelljen cserélni.

http://www.railwaygazette.com/news/single-view/view/managing-maintenance-on-the-tokaido-shinkansen.html

"...

In 1997 the committee reported that 'given proper maintenance, the need for large-scale replacement should not arise for some time', which it suggested could be as much as 20 years. We plan to begin reinforcing several of the major structures against fatigue and deterioration after another 15 years, starting in 2017. As the cost of this work is expected to be very high, a reinforcement fund is being accumulated every year.

Studies are also underway to develop repair methods that will not affect the operation of trains, and to set up an improved regime for maintaining the structures properly against fatigue and deterioration.

..."