Ngauger's 2021 do something challenge

[ngauger]

I purchased the rail joiners, so I guess I'll start with them:

   

The center package is the rail clamps that need to be installed.

There are a bunch of the standard Aristo joiners on the layout that need to be replaced.
For example:

   
The top line is the main and was done about 3 years ago.
The lower line is the trolley line that I want to update.

   
The right line is the updated area, the left is what i need to remove.  This section is about 10 ft. long under a 5ft tunnel.