White Pass & Yukon Route No. 107 is a DL-535E type narrow gauge diesel locomotive built by the Montreal Locomotive Works in May 1969 for the White Pass & Yukon Route (WP&Y) in Skagway, AK. It is one of ten DL-535E type diesels that were custom-built for the WP&Y between 1969 and 1971.
In 1992, it was sold to Sociedad Colombiana de Transport Ferroviaro in South America alongside sister diesels 101, 103, 104, and 106, but were later sold back to the WP&Y in 1999 for tourist excursion service. It served in excursion service for the WP&Y until being sold in April 2020 to the Durango & Silverton Narrow Gauge Railroad (D&SNG) in Durango, CO alongside sister diesels 101, 103, and 106. It and 101 were delivered to the D&SNG in September 2020 while 103 and 106 were later delivered in September 2021. It then entered service on the D&SNG in December 2020.
As of today, it continues to serve in tourist excursion service at the D&SNG alongside 101, 103, 106, and their other narrow gauge locomotives. In May 2022, it was repainted from its WP&Y yellow and turquoise paint scheme to a D&SNG orange and scarlet paint scheme.