If you are visiting Helsinki this year and considering the Tram Tour (RS Scandanavia 2024, pages 722-725), be aware there are tram route changes. A stretch of the tram line is under construction, traffic has been rerouted, and you can't complete the tour as a loop. Maps showing current tram routes are posted at every stop; I haven't checked but it's likely the map is also posted on the HSL website.
I haven't taken time to figure out a work-around to share (we used the hit-and-miss method; it worked out but I wouldn't want to confuse someone else!). We were using a 24 hour transit pass so didn't have to be concerned about getting on and off several trams to get back to our hotel. And, being May 1 and the "Vaapu" holiday in Finland, our tram rides were quite entertaining:).
I have submitted the information to the RS staff but want to get it out there for anyone who might be headed to Helsinki in the near future.