As I understood all the land borders of Azerbaijan are still closed, since covid, at least until october - so is there still any train running ? Maybe a deliberate policy to keep out enviro-ngos and 'hippy traveler' types who might carry infectious democratic ideas (including to the COP)?

Vue du décollage parapente...

Mais quelle concurrence va venir au plupart des lignes belges, et pourquoi est-ce que cela ferait mal ?
J'ai plutôt peur de l'effet de changement du gouvernement en wallonie.

I've long dreamed of going from Europe to New Zealand by train and boat, but that route is not currently practical / ethical. ( fwiw, I used to know it well, in more friendly days I organised the 'climate train to Kyoto' )

Further south people used the 'silk road' route across the Caspian sea - until Azerbaijan closed land borders.
(note: for info about crossing borders in central asia the forum on caravanistan can help).

That leaves only the route via Turkey - Iran - Pakistan - India, which is possible (depending your passport and visas) although it’s dodgy across Balochistan. And then, after India, there is also a war in Myanmar. So, can only hope for better times.

Maybe it's the expression on the face of the russian provodnitsa ?

Ce serait dommage perdre les pass à dix trajets, qui sont pratiques surtout pour partager entre famille ou groupe, de façon simple et spontané. Ils sont aussi utiles pour traverser le pays entre coins opposés de wallonie et flandre, que les gens font rarement, mais importe pour la cohesion du pays. Mais peut être le sncb manque de l'information, comment ces pass sont utilisés (qui pourrait possiblement dévaloriser certains lignes de long-distance en ardennes).

Modifiant le tarif selon heures de pointe ou creuses, me semblent un pas vers la système britannique.

Si on veux 'simplifier' la gamme des reductions, la système suisse Halbtax fonctionne bien (je doute qu'aucune suisse paie le plein tarif, cela c'est pour attraper des touristes de courte-visite - mais la suisse a bcp plus de touristes que la belgique).

I see that says 'has to be local only, not federated' (same issue also discussed on github).
'Local only' suggests to me front-end, i.e. info stored by browser. In that case people who are often switching devices would have to re-organise on each one, which could be tedious.
So isn't there something in between local and federated - i.e. saved by the instance as user-settings, but not pushed to other instances?
Maybe there could be some manual copying mechanism, so a user who organises a big set of communities could share with others. (This reminds me of mastodon 'lists' and various ways of organising and transferring them).

Well, I'm developing this interactive model. But only the history is data - which implies past, fixed - it's a model which calculates the future, in your browser, according to options you choose - the mechanistic dynamic is important for understanding.

As a small kid I learned i = i +1, before any maths teacher told me it couldn't.

Nearly 200 upthumbs, more ?!
But the discussion explores broader and narrow variants, need to coalesce.

This makes sense for mid-latitudes, but the timing of peak power will depend on how much energy the current youth in India and children in central Africa will aspire to use as they get older. That's hard to 'predict' - it's their choice of development pathway, but hope they don't follow China's route with so much cement, steel, roads, there are other options.

Ukraine is huge and has loads of track and trains that gauge, so do Lithuania, Latvia, Estonia, Moldova. There's even a ukrainian-gauge line running west to Katowice, could make sense to extend it, and make another to Gdansk. Otoh a transversal standard-gauge line connecting Romania to Poland via Chernivtsi and Lviv could also make sense.
Western europe should welcome the technical expertise of Ukraine and Belarus railways, they move a lot, efficiently.
Hey, not so long ago, there was even talk of a canal linking the Dnipro to the Wisla, recreating the old 'viking rus' trade-route (although have to consider also impact on wetlands... I recall used to sit next to the IPCC rep from Belarus - he was passionate about methane emissions from wetlands - but suffered from politics ...)