What do you mean inefficient?
Multiple things can be done at the same time on the country scale. Improve bike infrastructure and public transit, encourage EVs for those that have to drive, decarbonise energy generation, electrify heating and industry, etc.
With high-speed rail, you move ~400 tons of metal for ~450 people, a ratio of ~0.9. [0]
This does not even account for factors such as inherently more efficient transmission from steel to steel vs rubber/concrete and the more efficient electric engines of a modern train compared to the combustion engine. Neither does it account for the fact that rail goes at more than twice the speed.
How is public transport the inefficient option, again?
(I say that as someone who takes trains to work most days.)
Plus, in the context of the looming climate catastrophe and the energy crisis caused by a war of aggression by our former primary energy supplier, that concern seems really petty anyways.
Plenty do, or live a short bus journey away.
https://en.wikipedia.org/wiki/List_of_Singapore_MRT_and_LRT_...
Also a quick Kagi search could have pointed you at "Siemens Mobility awarded contract to deliver CBTC on Singapore’s 8th & longest fully-underground MRT Cross Island Line" ;)
Not sure how one can interpret "Singapore because they buy their excellent MRT trains from Germany" and then those excellent trains are a mere 3% of Singapore's trains (with the vast majority being Chinese and Japanese. Even the French trains are more than 3x as many). But hey, whatever.
“The electricity production from lignite was down 21 percent, hard coal was down 23 percent, natural gas was down 4 percent, and nuclear declined by 57 percent, compared to 2022 values.”