Ghost of the Railroad Engineer:
Thank you. Please help my poor fellow ghosts to rest in peace, even if only for a while...
Some might share their dream fragments with you as they expire, and they may be informative.
If you give them peace, I will find some things among the keepsakes my friends left me that might be helpful to your quest and give them to you...
Oh, but watch out for Nellis. He and his followers have gone completely mad. There is no getting through to them.