( 40.399203N79.816889) is a 2 degree curve and would permit class 4 track speed of 80 mph. A lesser cut would be required.
The Port Perry Branch diverges south from the mainline at milepost 339.5. The proposed 2 degree curve would have to be designed not to conflict with the Port Perry Branch. The diverging point could be changed to be further west and beyond milepost 339.7. The new alignment at 340.6 would cross over the Port Perry Branch requiring the construction of a flyover in order not to have a conflict.
From milepost 339.5 ( 40.396222N79.813836W) to 339.2 (40.393806N79.808617W) another orange line represents a 2 degree curve that would ease the existing 4.8 degree and 3.3 degree combined curve requiring a 45 mph passenger speed and 35 mph freight speed. This would permit track class 4 and 80 mph. Its construction would have an impact upon the former Westinghouse Air Brake manufacturing facility at Wilmerding, PA.
Either of these concepts would likely require significant environmental review.
See 49 CFR 213.17 for Federal Railroad Administration Track Safety Standards information.