mc ver 1.7.10 A railway tunnel meant for placing underground after you mine the tunnel out,. or.. not. it will be placed to your east the block under your feet. 15 blocks in length. continue to place it one after the other, or for faster longer tunnels place it in the air and stack it end to end, then cut and paste that underground. let the first block overwrite the last to make it even.
inside height is 5 blocks, 7 OD. inside width is 5 blocks, with 3 block width wall on each side. 11 wide OD. water and lava can spill into your tunnel from the walls. if you wish plug the holes before placing in permanent position, or add another wall layer to the sides.
styling is to complement rouge dungeons, a great mod.