Watching my steps to avoid puddles of water

Dark gloomy stone walls, dripping with slime

Two sets of raised tracks, each 9 feet apart with too-narrow paths near the damp walls

What if two trains enter the tunnel at the same time? I could be crushed.

Looking behind me, I see misty green trees in the distance. Mystery.

Looking ahead, I am nearly blinded by the bright sunlight. Light.

What an amazing space to enter AS LONG AS no trains enter.