1
$\begingroup$

Trains can be electrified either with DC voltage or with AC voltage. Various networks across various countries uses various standards.

My question is however for trams, which are basically a lighter version of a train who is able to criculate on streets. (I am fully aware some networks are in between trams and trains). All of them seems to be electrified with low-voltage DC, with the exeption of T4 in Paris and the T11-express in Paris which are more like a light-metro than a tram.

Why are trams never electrified with AC ?

$\endgroup$
0
0
$\begingroup$

(Your T4 article states they use 750 V DC.)

DC is easier to use on-board the tram. Old designs would use DC motors which could be fed directly from a DC supply. Modern designs can use AC motors with AC generated by on-board electronic inverters. It's easier to feed the inverters with DC rather than rectify and smooth a single phase AC supply. It's also easier to use DC with batteries and super-capacitors.

$\endgroup$
1
  • $\begingroup$ I never rode the T4 so I can't know but apparently the "new branch" east of Gargan uses 750V DC while the "old branch" between Aulnay and Bondy uses 25000V AC. To be verified. $\endgroup$
    – Bregalad
    Feb 10 at 10:56

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.