@ki
1) It's a trolley, not a train, so its speed is limited, making a derailment less dangerous.
3) the trolley seems to be empty, otherwise someone would be able to engage the safety break
4) no passengers are mentioned, which further implies that the trolley is empty
5) No drivers is mentioned, combined with a braking distance of ~55m for old style trams at 50km/h that again strongly implies that the trolley is empty

@SnoopJ