in train

in train

(of arrangements) in progress; being proceeded with.
2005 Architectural Review ‘China's New Dawn: an Architectural Transformation’ is a mainly pictorial survey of some 50 projects, recently completed or in train.
See also: train

in ˈtrain

(formal) being prepared; happening: The plans for the Queen’s birthday celebrations are all in train.Changes to the law have been set in train.
See also: train