I only take credit for the lighting set-up, the scene was created by the very talented Clinton Crumpler!
(https://www.artstation.com/artwork/X02eY) (https://assetstore.unity.com/packages/3d/vehicles/city-subway-train-modular-142060?fbclid=IwAR29ffMgFtA9rzESjwRT9Or3ELUqfRDxciL_gXjNDI-ggMqW9EV3XQl_wD8)
On recommendation, I took one of the pre-made scenes Unreal has to offer and relit it with a different theme in mind: more grunge and old than the original theme. It was so much fun working out how to make the lights flicker and how to marry the colours together.