Add:station 2 OK
Add:stack OK
Add:station 1 OK
Add:stack OK
Top:stack 1
Remove:stack OK
Remove:station OK
Stack 2
Size:stack 1
Train 1
Remove:stack OK
Remove:station OK
Stack
Size:stack 0
Train 1 2
Add:station 4 OK
Add:stack OK
Add:station 3 OK
Add:stack OK
Top:stack 3
Remove:stack OK
Remove:station OK
Stack 4
Size:stack 1
Train 1 2 3
Remove:stack OK
Remove:station OK
Add:stack Turntable empty!
Stack
Size:stack 0
Train 1 2 3 4