LNG was also considered for the French TGVs and the American rail system in the '60s, but then the oil crisis happened.

Fossil fuel prices are extremely volatile, so alternate power sources are actually more financially secure for railroads.

The interesting thing about electricity is that it's a great decoupling interface to the power source: you can change the power source and basically leave the remainder of the device/infrastructure as is (not that it's not challenging per se to move say from coal to nuclear to renewable, but hey, if TGV were LNG-based we'd be in a tough bind to move away from it)

The Soviet Tupolev Tu-155 from 1988 also ran on LNG: https://en.wikipedia.org/wiki/Tupolev_Tu-155

as a totally lambda citizen : natural gaz is a co2 emitter, so it's a no. The fact it's cheap is not enough anymore.

> "a totally lambda citizen"

I've never encountered this use of "lambda" as an adjective; care to explain?

I imagine she/he's is a native french speaker. In french a "lambda" object/person is a non-specific, average one.

ah, it's a bad influence from my mother tongue. Lambda means "anybody", but that's just, well, not english :-) I wonder how somebody says it in english.

You might want "layperson", meaning non-expert. Is that want you intended to convey?

I would say the common word is "average".