sentences:  Locomotives number 3098–3110 were rebuilt with new bogies allowing a higher maximum speed (160 km/h) in the 1990s (3111 and 3112 were originally built for this speed), but since 2003 they have been restored back to the original top speed due to the speed being raised at the expense of tractive effort (possibly the delivery of the faster Sr2 class also had an effect).The last Sr1 to be equipped with bogies allowing 160 km/h was number 3107.Three Sr1 class locomotives have been damaged beyond repair and withdrawn from service