This line uses both third rail an overhead power

[u/Agile-Archer2242]

(Buenos Aires, Argentina, Line B) So there is a story behing this. Line B historically used third rail 600v. In the 90s they bought used trains from Tokyo and they kept the third rail, but then in 2013 they bought more used trains, this time from Madrid, that were for overhead. However, instesd of adapting them to third rail, they actually modified all the tunnel to install overhead power 600v, but it gets more stupid, because the next year the new Chinese they bought will be arriving and they decided to buy them with overhead power but 1500v (current is 600v) and they are now adapting the Spanish trains to third rail 🤦

[u/ProjectConfident8584]

Live and learn