In Capitalist nations, the further we are from the era of peak Unions and in general civil society movements (which was just after WWII) the slower infrastructure improves from one year to the next, something visible not just in trains but at all levels (even National Health Services for those countries which have them).

The same thing will happen in China now that they're getting more Capitalist than Socialist.

It was never the Capitalist part doing the kind of improvements that benefit most people, it was the stuff outside Capitalism (that used it as a Trade Philosophy only) constraining it and guiding it for policy ends which were independent of Capitalism.

This slowing of improvements of course itself accelerated with Neoliberalism, since that stuff is mainly about making Capitalism the sole definer of policy, or in other words make Capitalism the entirety of politics, hence unconstrained and unguided by interests other than those of Money, so ever less policy was done for the greater good.

Capitalism is reasonably decent at optimizing Trade in the short and mid-term, but is completelly shit for non-Trade interests such as Quality Of Life, as well as for anything which doesn't have direct and reasonably immediate action-consequence links such as situations where negative effects are very delayed in time (for example, companies enshittifying their products but keeping on going for years on the inertia of brand name) or emergent in nature (i.e. things that appear due to the accumulation of the actions of many actors, such as Global Warming).