Double Track Upgrade?


So I was watching This video on youtube when I was bored. Can anyone explain what the Double Track Upgrade is that appears at 3 minutes 14 seconds? Why have I never seen it?

#2 < this one?

In the alpha a Line was default connected to 1 locomotive.

So, if you wanted more as 1 locomotive, you needed the “double track” upgrade to get 2 locomotives on a line.


So in alpha you could only have 1 loco per line without this?


Yes, that was the case.