Answer:
On the right track
Fallen by the wayside
Full steam ahead
Full head of steam
Letting off steam
Don't blow your stack
End of the line
Backtrack
On the fast track
Wrong side of the tracks
Light at the end of the tunnel
Train wreck
Plans got derailed
Off the rails
On rails
Making headway
Chugging along
Watch your caboose
Step-by-step explanation: