Heavy Machinery is a cancelled racing / car combat game that was in development by Scavenger for the Sega 32X. The project started as a game called Nitro Wreaks, that was meant to be published for the Mega Drive / Genesis, but after some time the team decided to move it to the 32X. As we can read at the 32X Memorial Site:
According to a magazine preview of a nearly complete test version, the game was to consist of nine missions through many types of locales, weather, and road conditions. Enemy vehicles would attack you and attempt to block your path, while helicopters and planes fired on you from above. Your mission was to destroy as many enemies as possible with your weaponry, as well as make it to the next checkpoint within the required time. Hazards and power-ups littered your path, creating an obstacle course that was said to really effect the gameplay.
Even if it was almost finished, Heavy Machinery was never released, probably because of the failure of the 32X add-on.
Thanks to Celine for the contribution!