Looking at the picture, the terrain is flat. If it were to make the corners after the rail switch without derailing due to speed it wouldn't go faster than roughly 15km/h, so derailing would kill no one inside, nor anyone at the switch, or standing close, as de derailment would mean a near immediate stop due to the weight. The G forces with this stop are minimal and people might bump their hear or something, likely not enough for a concussion. Even if it were to go 20 or 30 the chance of lethal injury would be insanely low. I doubt city trolleys go faster than 30, especially around rail switches.