Solution for overspeed monitoring of an elevator car

An elevator system comprising:

• at least two elevator cars adapted to travel in respective separate hoistways of the same building, the at least two elevator cars including a first elevator car and a second elevator car,
• wherein the first elevator car has a first rated speed and the second elevator car has a second rated speed different from the first rated speed, the first rated speed being a lowest rated speed for any of the at least two elevator cars and the second rated speed being a rated speed higher than the lowest rated speed,
• wherein the second elevator car is provided with an electronic overspeed monitoring equipment configured to stop movement of the second elevator car, if the speed of the second elevator car meets an overspeed threshold, wherein the overspeed threshold depends on a distance to at least one end terminal of the hoistway and the overspeed threshold decreases towards at least one end terminal of the hoistway, such that a height requirement for a bottom end terminal space and/or a top end terminal space is substantially equal for the separate hoistways of the building, the overspeed threshold at a least one distance to the at least one end terminal of the hoistway being higher than the first rated speed.