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While not in Eastern Europe, I would also recommend Portugal. Much less developed than Spain's railways with old locomotives and rolling stock. The Douro Valley line with its 1400 locomotives is fantastic and Portugal's prices are more like Eastern Europe than many other European countries these...
I went to Bulgaria last autumn, as mentioned above, the rolling stock goes from poor to dilapidated, though the scenery particularly in the north is nice. The remaining narrow gauge line from Septemvri and the broad use of ex-BR electric locomotives on freight increases the interest. Services...
On Trainsplit I set the outbound via as Liverpool and the return via Helsby and it suggests a ticket from Llandudno Junction to Warrington and Warrington to Manchester
I have sent a direct message on Facebook to Avanti to request a seat reservation many times. I uploaded a photo of my reservation or ticket. They have always been very prompt and helpful
Advance tickets from Sheffield to Cleethorpes are available for £10 less. Interestingly Trainsplit shows the flexible ticket at £29.60 with no splits offered
The museum participates in the "Days Out Guide" 2 for 1 entry if you hold valid rail tickets and are planning to visit with someone else of course
https://www.daysoutguide.co.uk/london-transport-museum