Can you help me remember the title of a game?

I was playing a train game when I was 6y/o. It is a train game, where I will create train, connect then with the engine, mortar and all that stuff.

I need to destroy the enemy base (red) and my train and base is color yellow.

Another detail i you can kill dragonfly and it will turn to money.

I believe the game has the word "steam"

I really need your help guys :(