The other sealed off compartment - which one do you mean, the archway above the station entrance or the arches maintaining the canopies across the station on the front side?
Both of them are fitted with wires as I am known to believe, probably the station entrance contains the circuit board for the sound effects, while the arches under the canopy across the front side contain the LEDs used to power the light up feature being the station numbers above each track, but this feature has no way to trigger it - the circuit is probably not complete therefore the feature does not work, since the item was released towards the end of the TrackMaster HTC era - meaning the development of the item was never fully completed.
Both of them are fitted with wires as I am known to believe, probably the station entrance contains the circuit board for the sound effects, while the arches under the canopy across the front side contain the LEDs used to power the light up feature being the station numbers above each track, but this feature has no way to trigger it - the circuit is probably not complete therefore the feature does not work, since the item was released towards the end of the TrackMaster HTC era - meaning the development of the item was never fully completed.