Ironwood Capital sold Tunnel Hill Partners, the largest integrated waste-by-rail company in the US, to Macquarie Group. The company provides a variety of services including hauling, recycling, beneficial reuse, transfer and disposal to commercial and industrial customers throughout the Northeast and Ohio. Financial terms were not disclosed. Macquarie sees potential for Tunnel Hill's growth profile to be attractive to larger vertically-integrated companies, or possibly another private equity firm, in the future.