30907 and j2002 , many thanks. Excellent suggestions.
I assume branch lines such as Sedlcany have no freight so it's extraordinary that they survive into the second quarter of the 21st century with single car railcars.
These lines are usually pretty low-speed, low-cost to operate. It'll just be one (lightweight, as in the image provided by
@j2002) unit in operation and most intermediate stops are just gravel with a shelter and sign or two. Most have a conductor but some don't. The Czech Republic tends to occasionally close lines which have become too costly to maintain, especially when a bus service would be significantly quicker.
When the 810s become totally life-expired, who knows what will happen. But ČD still continues to refurbish them, with some in the Ostrava/Opava area reclassified as 811s with brand-new seating and power outlets. They've even gained the brand name 'Regiomouse'.
If you're feeling like an early rise - the Neratovice to Kralupy nad Vltavou line has two early morning return trips operated by KZC Doprava. Its usually one of the same lightweight railcars as in the photo above, but in a closer-to-original condition. You'd be back in Prague for 9am in time for a proper day trip! Timetable here -
https://m.kzc.cz/?sekce=pravidelne_verejne_vlaky&stranka=linka_s43