求翻译：从改建目标、设计能力、提速方案、提速效果等方面，对既有线的平纵断面改建、增建二线的平面、纵断面以及横断面进行了设计。是什么意思？

From the alteration of the target, design capabilities, speed program, speed effects, etc., cross and vertical sections of the existing lines, alterations, additions of second-line plane, longitudinal and cross-sectional design.

Conversion from target, design capability, speed, acceleration, as well as on the flat line 纵断面 alterations, additions of 2 as well as transversal plane, 纵断面 designed.

From the reconstruction goal, designed capacity, put forward the fast plan, raise aspects and so on fast effect, to already the wired even longitudinal section reconstruction, additionally constructed two planes, the longitudinal section as well as the cross section has carried on the design.

From the reconstruction programme of objectives, design capabilities, speed, speed-increasing effect, profile alteration to the existing line, the second line of planes, longitudinal section and cross design.

正在翻译，请等待...