In 2021, @bookbndrbob posted this stamp cancelled at Basel's Badischer Bahnhof.
https://goscf.com/t/8094&whichpage=32#707264Walking from the bus stop at Neuhausen am Rheinfall to the waterfall, I saw a sign pointing towards the "Bahnhof DB". Originally Deutsche Bundesbahn, and currently Deutsche Bahn, DB is the main railway company of the Federal Republic of Germany - hence Bundesbahn -. The canton is almost fully encircled by the state of Baden-Württemberg. The Rheinfall is very close to the German border.
In addition to the two Swiss 'SBB' stations in Neuhausen, this third, German station is known as 'Neuhausen Badischer Bahnhof".
Will a similar cancellation pop up with the name of that station?

I stayed at the 'Bahnhof Hotel' in Schaffhausen, accross the road from the main station in Schaffhausen (depicted above). In addition to bus services, there are regular trains to four - there is another one - stations near the Rheinfall from Schaffhausen Bahnhof.
The bridge in the stamp posted by @BobInRye is a railway bridge on the Zürich - Winterthur - Schaffhausen railway lines. The fourth station is just to the right of the waterfall. On both sides, there are footpaths. One was closed for the winter. You can cross the Rhine from Neuhausen to Schloss Laufen. From there, you can get to within a few metres of the waterfall.
Looking out of my hotel-room window, I noticed something odd about the façade of the station. It said Deutsche Bundesbahn. I was not aware Schaffhausen had been German. It has not.

Clearly, this used to be a border station with an entrance for the train service across the border and an entrance for the train service into Switzerland.
How about a German stamp cancelled at Schaffhausen?

I am old enough to remember borders. Nowadays, we are not so keen on borders in Europe. At Zürich Airport, there was no check at all. But a few decades ago you would have to show your passport when crossing the border by train. Sometimes, that meant alighting at a border station, passing the border check and board further along the platform.
During my lifetime, Belgium, the Netherlands, and Luxemburg never had such borders. Checks were random. At the turn of the century, checks at the German border were done during the ride across the border. Now, your only worry is whether customs will walk through the train with a sniffer dog. If not, you can catch a train to the Netherlands, buy weed, ride home, and enjoy it in another country.