Class 313 Emergency Braking randomly when DSD is unisolated. It shouldn't do this and should only e break if the driver leaves the chair
DSD acts like DVD, hence the emergency braking. It's been broken since the release of the 313 and DTG's glorious workaround is to "leave it off, we wouldn't notice a difference in regular operation anyway". Allegedly a fix was already being worked on in October but it was never released.
In this case the workaround isn't a bad one; the 313 has an old-school DSD, just a deadman's plate, and since in game you never have a heart attack it really doesn't matter if it's on or off. Turning it on, yes, makes it behave like a DVD (alerter), which the RL 313 never had.