Dreaming of trains and empty railroad spaces can symbolize a journey or transition in your life. Trains often represent movement towards a goal or a significant change. The empty railroad may suggest feelings of isolation or uncertainty about the direction you are heading.

The tunnel in your dream could represent a challenging phase or a period of darkness that you’re currently experiencing. It may indicate that you feel like you are in a situation where you can't see the light at the end, suggesting a need for patience and perseverance.

The presence of a lot of people, reminiscent of an amusement park, could symbolize the distractions and chaos of everyday life. It may indicate a desire for fun and excitement or reflect your feelings about social situations.

Lastly, trying to find someone you don’t know could suggest an inner search for identity or understanding. This unknown figure might represent a part of yourself that you are trying to discover or aspects of your life that you feel are missing or unfulfilled.

Overall, this dream seems to reflect a journey of self-discovery amidst feelings of isolation and the search for direction. Consider what changes or transitions are happening in your life and how you can embrace them while seeking clarity.