I saw that this rail is closed when we need to travel to Murren from Lauterbrunnen on May 28 2023. Is it difficult to find the 141 bus to Stechelberg after arriving to Lauterbrunnen train station?
I do not think so, as it is likely at least 1/3 of the people on the train will be heading that way as it will be the only way to get to Muerren. Follow the crowd (of those not going to Wengen).
Your default assumption regarding public transit in Switzerland should be that you will not have any issue finding the correct bus, train or other means of transport. Just keep your eyes open, and if necessary, do not be afraid to ask someone. Most of the people you will see on public transport are regular users.
Thanks to all of you for answers! I am leading five of us and this helps!