Incremental upgrades to existing lines could keep the railways from clogging.
对现有线路的逐步升级，或将避免铁路线的阻塞情况。
2
Unfortunately in the congestion cost allocation to congested lines, the shadow price method and the marginal and incremental method existed have some defects.
然而在阻塞费用对阻塞线路的分摊中，目前提出的影子价格法和边际微增法仍存在一些不合理的地方。
3
The incremental method, differential equation method and integral equation method are three main methods in zero-sequence parameters on-line measurement of transmission lines with mutual inductance.