Stránky přátel železnic (SPŽ)

The excellent SPZ site is a good place too look for railfan information. Much of it is in Czech but there is some text are now in English as well. Much of the other content, such as depot allocations and photos can be understood without a detailed knowledge of Czech.

http://spz.logout.cz/

Vlaky.net

News and photos from Slovakia and the Czech Republic plus other useful information including loco diagrams. Slovak language.

https://www.vlaky.net/

Zelpage.cz

News and photos from the Czech Republic. Czech language.

https://www.zelpage.cz/

Czech Slovak Gen

A useful English language news group for the exchange of information on Czech and Slovak railways, particularly the current scene.

https://groups.io/g/cdgen