Which Country Has the Best Train System in Europe?

Almost every country in Europe has some sort of passenger train system. What is your favorite system and why? (Is it because it carries a lot of people? It is an old system? The stations are really beautiful etc.) Share your opinion in the comments section!
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   • What is the Best Metro/Subway System ...  

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Included are almost all the countries in Europe that have passenger rail of some sort. Wikipedia was used to provide the facts and unfortunately it did not always provide good information as some systems are rather small.

For complete videos of the train systems in Europe:

Albania:
   • Discovering Albania, in local train f...  

Austria:
   • S-Bahn and Passenger Trains in Vienna...  

Belarus:
   • [БЧ] Belarussian class EPg9 EMU from ...  

Belgium:
   • Passenger Trains of Belgium  

Bosnia and Herzegovina:
   • Train/Bahn Mostar to Sarajevo - Rail ...  

Bulgaria:
   • Trains from Bulgaria- RUSE part 2.  

Croatia:
   • [4K] Short compilation of trains in C...  

Czech Republic:
   • Czech passenger train.  

Denmark:
   • Danish Passenger Trains  

Estonia:
   • The Estonian Railroad System  

Finland:
   • Trains of Finland  

France:
   • SNCF French Trains in Bordeaux, France  

Germany:
   • Deutsche Bahn 2016 - All Kinds of Tra...  

Greece:
   • Greece: TrainOSE loco change at Paleo...  

Hungary:
   • The Hungarian Passenger Railroad System  

Ireland:
   • DART Passenger Trains in Dublin, Ireland  

Italy:
   • Italian Trains in Picturesque Lake Is...  

Latvia:
   • The Railroad of Latvia - Trains of La...  

Lithuania:
   • Passenger Trains of Lithuania in HD 1...  

Moldova:
   • Trenuri / Trains - Moldova  

Netherlands:
   • Passenger Trains in Amsterdam, Nether...  

Macedonia:
   • TRAIN CROSSING AT DRAMAS RAILWAY STAT...  

Norway:
   • Passenger Trains in Norway - Norske Tog  

Poland:
   • Passenger Trains in Poland.  

Portugal:
   • Passenger Trains in Lisbon, Portugal  

Romania:
   • (HD) Trains in Romania - July 2018 in...  

Russia:
   • Short Train Ride Across Russia.  

Serbia:
   • Train, Zug, Vonat, trains in Serbia (...  

Slovakia:
   • Old Passenger Trains of Slovakia - Os...  

Slovenia:
   • Trains at Murska Sobota, Slovenia 14....  

Spain:
   • Ferrocarril Alrededor de Barcelona: R...  

Sweden:
   • The Light Rail of Stockholm, Sweden  

Switzerland:
   • Passenger Trains in Zurich, Switzerland  

Ukraine:
   • Электричку догоняет и обгоняет поезд ...  

United Kingdom:
   • Passenger Trains of England, UK  

Thank you for your support. Comment below so all of us can have a productive and insightful conversation about transportation!