New Release -- November 5th, 2013

[Taz D]

Originally Posted by Clohar

Some of my friends are experiencing problems to dispatch trains when two engines are connected to the same 12 long cars
Some are on town mainframe wf-4 wf-38 and wf-40

You can no longer dispatch multiple trains using the same cars. That glitch was fixed to prevent that from happening.
This is from the October release:
The security exploit that allowed to dispatch more than one train using the same freight cars is now fixed. This include the case where 2 locomotives were attached to each end of the train and then dispatched separately, this can't be done now.