engineering district;maintenance of way section;track division;track district;track maintenance division
First frost date and late frost date
first frost date and latest frost date
Girst frost date and late frost date
onset date and end date
onset date and ending date
order due date prior to current date
order due date prior to planning start date
order starting date adjusted to calendar date
3 level maintenance tset
active maintenance downtime
active maintenance time
active preventive maintenance time
Adaptive Maintenance
适应性养护
自适应维修
循序修正最佳化
自适应速度控制
适应维护