NECSO diesel-hydraulic Ferrotrade DH type JT 500 shunter at work at Tardienta (Tardienta-Canfranc line), 10/04/2003. NECSO no 039 11 001 (P 501 MZOV), UIC number 93 71 131 05 012. Weigth 30 tn. Photo by Jean-Pierre Vergez-Larrouy (roverg@tele2.fr)