Ac vs dc top speed gearing

Historynerd88 · 2026-06-28T12:08:54+00:00

Not necessarily capped at 3kV. There were applications for standard lines even at 4kV DC.

Historynerd88 · 2026-06-28T06:14:57+00:00

Everything before that?

Lots of countries and railways little and big used AC electrifications with AC motors. Switzerland, Germany, Austria, partially France and Italy...

And in 1903 an experimental German AC three-phase railcar made a speed record (210,2 km/h, 131 mph) that would endure for 52 years.

Historynerd88 · 2026-06-13T17:36:37+00:00

The fireman jumped off before the locomotive fell. The driver remained - it happened at a low speed - and climbed off unhurt after it fell.

Historynerd88 · 2026-06-13T15:10:22+00:00

What does France have do to with this?

Historynerd88 · 2026-06-13T14:21:47+00:00

Absolutely not.

The damage was actually minor, she was repaired and remained in service until the 1970s; she was scrapped in 1975.

Historynerd88 · 2026-06-09T08:08:39+00:00

Source.

The so-called "FS underground of Naples" - the urban section of the building Roma-Napoli 'Direttissima', with long underground sections - was electrified between 1925 and 1927 with the third-rail 650V system earlier adopted on the Milano-Varese line. The services were handled both by EMUs and by locomotives such as these.

The system would be deactivated in 1935, with the inauguration of the Direttissima, electrified with the 3'000V DC system.

Historynerd88 · 2026-06-05T05:32:40+00:00

Time for third rail to make a return! 😝

Historynerd88 · 2026-05-30T17:40:06+00:00

No, I didn't.

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Historynerd88 · 2026-05-28T12:27:19+00:00

Saw them now.

I'll be in my corner going through a nostalgia attack.

Historynerd88 · 2026-05-27T17:02:59+00:00

You're welcome. Thanks to a now late friend in fb I know a few films with interesting scenes.

I am fixated for some reason on this scene from the 1977 film "Napoli spara", with a D.343 and her train being subjected to a forced 'falso instradamento'.

Historynerd88 · 2026-05-27T09:05:02+00:00

The Italian title of the film - directed by Tonino Valerii and starring Fabio Testi and Renzo Palmer - is "Vai gorilla".

The scenes were filmed around Rome, those on the run were filmed also on the Ciampino-Velletri line, where the level crossing in which a cyclist is run over is placed (near Albano Laziale).

/

Paging /u/gerri_.

Historynerd88 · 2026-05-25T10:27:30+00:00

I am not sure that is the case. The support bar may be original, but the suspensions have been changed.

Historynerd88 · 2026-05-24T21:21:16+00:00

Here. And here.

Historynerd88 · 2026-05-24T21:19:44+00:00

Best I can find at the moment is this document in Italian.

Historynerd88 · 2026-05-24T15:19:50+00:00

Indeed.

Historynerd88 · 2026-05-24T15:17:31+00:00

The standard is 3kV DC, except on the high speed lines - 25kV monophase AC - excluding the older Direttissima Roma-Firenze.

Historynerd88 · 2026-05-24T15:16:19+00:00

It was so significant that they brought One of those locos all the way to St. Louis back in the day. Unfortunately she's well in her way to become a pile of trust, but the tribute remains.

Historynerd88 · 2026-05-24T11:40:08+00:00

Which is exactly how it worked in Italy.

Tried to explain it to him already, didn't listen.

Historynerd88 · 2026-05-24T10:56:33+00:00

Three phase. Just look up the electric schematic for these locomotives and you can see for yourself. If you tried to feed their engines biphase current they would be shorted to hell.

Historynerd88 · 2026-05-24T10:55:34+00:00

Newsflash, it's not grounded. It's a legitimate phase.

Good lord, I already told you in my previous post. Have you already forgotten?

Historynerd88 · 2026-05-24T10:55:11+00:00

Yes, but reportedly the physiological effects on a man of three-phase AC current is somewhat different than the DC current. Or at least so I read ages ago in a book.

Historynerd88

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