求翻译：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？

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

Design capacity, speed, and speed programs, both on the flat 纵断面 alterations, additions, and 2-Wire flat and 纵断面 transverse to the design.

Designed capacity, puts forward the fast plan, raises 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.

Aspects of programme 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...