If the bus in Tirano stops at the street: Via calcagno 19, then according to google maps it is 180 meters to the RhB Tirano station, I see.

I'm going to wait for the train company customer service to say where the replacement bus will stop in Tirano.

When I look at the address and street view of the bus station in Colico via the link you forwarded in this topic, for which many thanks, this does not seem to be correct.
You can barely see anything on streetview.

If you then calculate the route between Colico FS and the link of the bus station, this is 550 meters!

So I'm curious what Trenord customer service will say regarding my questions about the replacement bus.

@Angelo 

Guys find this in trenord site 

https://www.trenord.it/en/news/trenord-informs/notices/milano-lecco-colico-sondrio-tirano-changes-from-26-june-to-9-september/

but the replacement bus service busperego  has written 

http://www.busperego.com/news.php?id=16470

“Lastly, we would like to point out that always on Sunday 26/06 the trains from Tirano to Colico will be canceled and there will be replacement bus services. Info on the trenord website.”

Anyone know if the replacement is for Sunday only and weekday are normal? 

I think it's all July/Aug m' on the Trenord app (which was updated yesterday) it now shows the train+bus when you search Milano to tirano

I think they used Google Translator and want to write from Sunday 26/06. The line is 100% closed due to works.