The bridge builder is a tool that can be added to a cart to allow it to place down blocks to act as bridges for tracks

This is best used in combination with the Railer on a cart to create a minecart track

if you are using this underground then you should use this with a coal engine and at least a reinforced drill

this can end up with it burning in lava though

Use this if you are busy with other things (ex. building something big, using thhings from mods like Buildcraft, Tekkit, Flans Mod, PneumaticCraft etc.)

Or if you're just plain rich with iron and want to be lazy :P

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