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Engines 4151, 5009, 3199, and 4104 are pulling train HOLFM across the Mermentau River swing bridge on January 5, 1986. Unless otherwise restricted to a lower speed, all trains are restricted to 35mph while crossing this bridge.
The first and last units in the locomotive consist are GP20s. The SP/SSW began receiving GP20s in 1960. During a rebuild program most had their 567 engines replaced by non-turbocharged 645 engines. However a few of the GP20 went through the rebuild program and retained their 567 engines and turbochargers. Disk 101