Where does an engine store its services and how can I get them via their container

According to the docks engines have their own container isolated from the host app. I created a service for my engine that allow us to route from anywhere since routing within an engine is a pain in the a$$. Now I’m running in a situation where I need to dynamically lookup an engine router service. An engine does not have a lookup method and just visually exploring the engine object I cannot seem to find the service. Where these engine services live? How can I extract them?