As the layout would be completely covered the layout had to be electrified.
The track was divided into different sections so power could be selectively supplied to different areas allowing the two engines to be controlled independently.
All the points must be solenoid operated as did the strategically placed un-couplers.
Although not the old style semaphore signals I would have liked, at least the led signals I did use worked.
Lastly, working street lights, station lights, etc. were added for effect. The whole exercise took around 6 months.