BehinduElm PArk You run the tram down the existing rail track as far as the proposed station and then take a spur off and around green park. Simple.
I agree timescales might be a problem. But if a thing is worth doing....
Don't trains generally have a different gauge to trains so you would need to run a second set of tracks
And wouldn't the trams get in the way of the trains using the same section of track ?
I'm no expert on this but I believe that they use the same gauge. IIRC, there was talk a few years ago about Reading introducing trams and that part of their route would be over existing rail lines.