A Metrolink heads under the classic ATSF signal bridge at the East End of DT Junction, and the 605 Freeway, while I wait with some other fans for #3751. This is MP 152.1, where the ex-SP Puente Branch crosses the BNSF on a diamond. DT also includes crossovers between the two main tracks. The name DT dates to when this was also a transition from single track to double track (DT). The train is the first weekend inbound of the day, and runs from Oceanside to LA. F59PH #858 is from the first F59PH order ever, in the Summer of 1992.