Bomb Train is a weapon in Jak 3.
A train cart, packed full of mining explosive and hanging over the edge of broken mine tracks.
The Bomb Trains are explosive-laden carriages encountered in the Eco Mine. There are about four that are left by the time that Jak arrives there. Three of them are in the area where the Precursor Robot is fought, and the fourth is activated by Jak to blast open the door that leads to the area. The first one seems to still have an active engine, as it is able to propel itself.
The trains are encountered at the same time as Veger's Precursor Robot when shot they drop and detonate. When all three are set off it destroys the robot.
This article is too short to provide more than rudimentary information about the subject. You can help the Jak and Daxter wiki by expanding it.