Thank you both for your answers.
I might be shunting in an odd area but there are so many tracks without power lines and tracks with power lines available for shunting are so limited.
I have very little knowledge about interlocking directions but that is something I have to learn more about.
I wasn't aware of the W5 sign, but then it makes sense that I can't drive past the station platform :-)
To shunt from LB_Tm305 and then switch train state to driving is just what I want to do so I will try to use the SetState method, perhaps called from a track trigger at the station platform, to make a smoth transfer from Maneuvering to Driving state.
I will report back on that.
Once again thank you.