My game has been updated to this build in anticipation of the new German DLC. Which has been released yesterday.
Apparently, this also got 'fixed':
MP15
“Cutting the Cars” and “Santa Clara Saviour” scenarios:
· Fixed an issue whereby the Independent Brake release objective could be cleared if the player moved the lever into the “Bail Off” position rather than the “Release” position.
-----
In the meantime:
The intrepid Czech hacker/explorer is well on his way deciphering the Scenarios and Timetables and finding out how they work. Apparently, the internals aren't as restricted as originally thought.