Pocket Densha, a Japanese Game Boy release, is likely a train simulation or management game. The title directly translates to 'Pocket Train,' hinting at the game's theme.  Gameplay likely involved managing a train, navigating routes, or possibly even building a train network.  The visual style would probably include side-scrolling and simplified representations of trains and landscapes due to the Game Boy's limitations.  More specific gameplay details and developer information are needed.

Pocket Densha (Japan)

Pocket Bomberman (Europe)