I spent a couple of years working at Newton Abbot (this century!) and it's very interesting for me to see where everything was. I did quite a bit of study into the station's long term history for some display boards which were intended to replace the Brendan Neiland Intercity prints (which I had my eye on!) in the end they never got finished because the station manager wouldn't release me to finish them off and I had already spent a lot of my own time on them. What I didn't know was how the place looked in the 80s.
It always used to sadden me that, stood on platform 1, looking at the industrial estate, I was never able to picture what sprawling railway vista met you from there. Likewise it was hard to visualise the through road and platform 4 when parking your car on the formation and climbing up onto the platform ready to start work!
A few things of interest, from a more recent era.
The old office at the east end of plat 3/4 still retains a beautiful parquet floor, and a fireplace if I recall. The barrel safe hidden under the floor is still there, but alas nobody can find a key for it these days.
Platform 1/2's buildings were of course predominantly replaced after the station was bombed. That story is a fascinating one, with stories of a rail from platform one flying as far as the bowling lawn at the top of the park, and a 'King' with a strafed tender tank.
Asbestos is the reason the buildings are not used, and their fragility. The problem is that they would be a nuisance (and expensive) to take down under the roof and without possessions.
Platforms 1/2 suffer from no longer having toilet facilities (the chargeman's 'shed' has one, famous throughout the WR as the place for train crew to leave 'gifts' for the station staff, which the poor bloke then has to cope with for the rest of the night) but the originals were never taken out - there is even some interesting period graffiti in there! The waiting room also still has a beautifully tiled mosaic floor, doubtless original from 1927.
Final bit of NTA trivia - the signal gantry outside the old D&C office stands on small patches of land donated to the local council, maybe a yard square under each foot. This was the reason the site was never developed into a Lidl as was at one time anticipated - they couldn't accommodate the gantry in the plans!