In general , for a two track railway the capacity is large and will satisfy demand far into the future , and the option of increasing capacity is not worthwhile 一般来说，双轨铁路的运载能力庞大，且能满足长远的需求，所以没有必要考虑增加系统的运载能力。
2.
In general , for a two track railway the capacity is large and will satisfy demand far into the future , and the option of increasing capacity is not worthwhile 一般来说，双轨铁路的运载能力庞大，且能满足长远的需求，所以没有必要考虑增加系统的运载能力。
3.
A single track system in 1910 , it was completely electrified and double - tracked by 1983 . the railway is undergoing signal improvement and train refurbishment works 九铁在一九一零年投入服务时是一个单轨系统，在一九八三年，已改善成为一个完全电气化的双轨铁路系统。
