For a fun little sandbox experience,
Train Frontier Express could be exactly what you desire.
INDIEGAMES.COM

A remarkably fully featured offering.
EUROGAMER

A nice break from all the side-scrolling Indie games.
KOTAKU XBLIG Pick

WINNER 2011
Indie Games Summer Uprising

Sousei No Aquarion -

You can BUILD, RIDE, SHARE with friends in a this landscape building and rail riding good time.

Sculpt your own landscapes, then HOP ONLINE to share your map, take a ride, or build together in REALTIME.

Train Frontier is both STYLIZED and FRIENDLY, taking inspiration from MODEL TRAIN SETS, while eschewing the more complex train sim format.

Sousei No Aquarion -

To fight back, humans use the , a giant robot formed by three specialized "Vector Machines". Why the Story is "Interesting"

Sousei no Aquarion (Genesis of Aquarion) is widely regarded as having an "interesting" story because of its bizarre mix of high-concept mythology, bizarre sexual metaphors, and a romance that literally spans 12,000 years . Sousei no Aquarion

The story is set in a future where humanity is nearly extinct following a massive disaster. They are constantly hunted by , immortal winged beings who harvest human "Prana" (life energy) to sustain their own civilization and feed the legendary Tree of Life. To fight back, humans use the , a