Track Movement at Bethlehem Steel

I'm sure this information is available in a bunch of places but when did Bethlehem Steel ask the LV to move its tracks further north closer to the Lehigh River?

Originally they went straight through what would become the plant site.

Thanks

It's hard to imagine Bethlehem Steel asking the Valley to do anything, back then. They were built, and owned, by the Valley, to manufacture rail, and bridge pieces. Realignment was done, to follow the canal, and footpath, that also became LV property, and offered better access, to some areas. The need for the yard, between the main, and the mill, is obvious, versus a yard on the river side, necessitating blocking the mainline, to service the mill. Departing the station, eastbound, the swing allowed the Florence yard to be built, and the mill could be switched, without delay to mainline traffic. This allowed Calypso to remain as the main switching yard, in the Bethlehem area, without clogging it up, with cars bound for the mill. Regards