Ballahoo is notable for its two bore railway tunnel. The first was constructed in 1915, but partially collapsed due to poor construction, thus dividing the tunnel.
The second tunnel was cut in 1922 when Henry stopped in the first tunnel and refused to come out. As it was impossible to move him, it was decided to instead cut a new bore. When Henry was finally removed, both tunnels remained in service. As a result of these events, the tunnels were nicknamed "Henry's Tunnel".