Question on supply lines

[BIG ERN]

Is there a limit on how much supply a rail line can hold.
For example if AGS is being supported by say 3 lines.. each moving 100,000 tons a week. If I cut one line does that mean the other 2 automatically carry 150,000 tons or does the game sat a limit?
The reason I ask is ..as playing Russian.. is it worth while cutting one rail..if the others automatically compensate? Maybe I should be setting other targets for my attacks?

[morvael]

Unfortunately in WitE railway has unlimited capacity, so a single line can be used to send as many supplies as needed.