Tunnel Interior Tile
The dressed length of bore, so a tunnel can be longer than its portal: coursed stone side walls up to the springing under a full arched roof sooted black at the crown, cable troughs stepped along the cess, a refuge recess with a stone surround in each wall for the gang to stand in, and the ballast formation running straight through. Same section and same hillside mass as track_tunnel_straight_tile, so the two butt as one bore — lay this one where the camera goes and the plain one where it does not, and cap the ends with tunnel_portal.
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