Happening, progressing (2,5)
I believe the answer is:
in train
(Other definitions for in train that I've seen before include "Being dealt with (going by rail!)" , "Being on board" , "happening?" , "using public transport" , "Moving forward" .)
I believe the answer is:
in train
(Other definitions for in train that I've seen before include "Being dealt with (going by rail!)" , "Being on board" , "happening?" , "using public transport" , "Moving forward" .)