Today's historic photo of the day: Queensland Railways 1067mm narrow gauge 1-C diesel-mechanical #locomotive DL4 sits in the yard at Townsville, Qld, July 22 1986. The first of the four DL class Gardner engined locos, DL1, was built in 1939. Diesel railmotors and railcars pre-dated it, and there were some earlier diesel locos on a dam construction railway in NSW, a timber tramway in Victoria and maybe elsewhere, but otherwise, DL1 may have been Australia's first diesel loco on a public railway.