Make the rear train to catch up the front one using available commands below.
Available commands,
drag commands from here
Stay 1 second
Train will do nothing for 1 second
Move 1 second
Train will move forward for 1 second
Jump to line
Forwards program to specified line in editor
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Execute if on station
Executes command to the right if train on station
Run program
Program zone (drop commands from left here),
it executes independently for each train