This is an addon for Block Relocation. It adds several blocks to help build moving contraptions:
Switch - like a lever, but is a full block. Crafted from lever.
Yellow Torch - a version of redstone torch which is liquid-proof. Crafted from redstone torch + yellow dye.
Yellow Dust - a version of redstone dust which is liquid-proof. Crafted from redstone dust.
Yellow Repeater - liquid-proof.
Yellow Comparator - liquid-proof.
Quick Hopper - an omnidirectional hopper, which transfers items directly from the back container to the front container on maximum speed. If there is no front container, will transfer items inside itself.
Block Buster - when powered, breaks block at the front and stores the drops. Can act as a Platform - the sides can be toggled via an empty hand. 
Block Placer - places blocks when powered.
Block detector - outputs a r. signal when a specified block is in front of it.
Short video demonstrating how to build a tunnel bore:
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Krosenut