News for hackers. Stuff that matters.

A comment on After 27 years within budget Austria open 6thlongest railway tunnel in the world. Parent comment

Re:After 27 years within budget Austria open 6thlongest rail... by MrFlynn on Friday December 12, 2025 @01:33PM (#46247141)
Early AC electrification systems in the US were typically 25Hz, not 16.7Hz. Parts of the northeast corridor still use 25Hz electrification.
[ Parent | on HN ]
Re:After 27 years within budget Austria open 6thlongest rail... by ErroneousBosh on Saturday December 13, 2025 @04:38AM (#46253315)
I'm trying to find the post, but it was definitely 16.7Hz. I don't know that it was particularly "early" as such, probably the 1950s or so.
[ Parent | on HN ]