The railways weren't obsolete 3 years after they were built, unlike GPUs.

Rolling stock was continuously upgraded.

Can't tell if you're joking or not, but in case you're not, here's an EU survey of rolling stock which says that it should last 25-30 years and represents only 1/5th of the cost of the rail network: https://www.europarl.europa.eu/RegData/etudes/STUD/2023/7472...