New Haven freight Advance OB-2 (Boston to Maybrook) gets underway out of the NH's South Boston yards behind a pair of U25Bs. It's about to duck under the Old Colony bridge at South Bay and head out to the mainline at Readville via the Dorchester branch. A/OB-2 was the NH's leg of a Boston-Chicago piggyback service that also involved the L&HR and PRR.

Photographed by Tom Nelligan, October, 1968.
Added to the photo archive by Tom Nelligan, March 2, 2017.
Railroad: New Haven.

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