Trains

Here is a likely incomplete list of trains that I've taken at some point.

Map version, with mainline services only. Träwelling. See also: planes. This is inspired by Kunal's similar list.

Notes for self:

Headings are for is (train category, continent[, country]), then each operator is listed with a sublist of routes/services where relevant.
Generally a country gets its own section if there are at least two entries that would go in it, and at least one item in that continent not for that country.
Cross-border trains are generally included twice, once for each country, assuming both countries have their own dedicated sections. If not, they're either listed in the country that has their own section, or simply on the continent level (e.g. Allegro) especially if it's a single service from an operator that's not otherwise included.
Jointly operated services are mentioned under operators relevant in that country — for example a Copenhagen–Hamburg EuroCity operated by DB and DSB would be mentioned under DB in Germany and DSB in Denmark.
Em-dashes are used instead of the plain hyphen symbol. Here is one for copy-pasting: –.

Mainline

Paris RER
- Paris Gare du Nord–Charles de Gaulle Airport
- Paris Gare Montparnasse–Versailles Chantiers
SNCF
- Toulouse–Bordeaux–Paris (TGV inOui)

DB
- Copenhagen, Denmark–Hamburg (IC cars, with DSB)
- Karlsruhe–Frankfurt Airport (ICE 4)
ÖBB
- Hamburg–Karlsruhe (Nightjet, on a WLBmz double-docker sleeping car)