According to Die Weiten Spuren by Jeanmarie the tunnel is #2536. The only catalog illustration is from 1930 so it might have been made both before and after that date. The O gauge is 2536/0 and is 27 cm long. The I gauge is 2536/1 and is 38 cm long.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .