Hi
I don’t exactly know what the manual generator is doint - but if you put an agent into the environment you just need to set the agent status: READY_TO_DEPART and as well its position = None. The agent is now located outside of the environment. Thus you have to further set the initial_position to the entry position. Means where the agent will entring the world.
The ending position is the agent’s target. Where the agent can be automatically removed or not. In the challenge setup it will automatically removed. RailEnv(…, remove_agents_at_target = True) -> remove_agents_at_target is set to true thus it reqeust the env to remove agents at target. It will be done as soon as the agent reached its target.