Rail strikes. The causes are backwards. One of the ways I deal with air quality is to introduce rail subsidies to the max, after the long 72 month period of implementation rail strikes occur. To solve rail strikes you either have to completely cancel rail subsidies (how does this make sense?) or completely underfund rail services (waiting another long 72 month implementation time) and change your labor laws to pro employer. To me these policy changes should cause a rail strike no stop one. Seriously what are these rail workers striking for? The removal of job rights and worse pay?
And after a while I think rail strikes should be a lot more likely to occur if you have no rail subsidies in the first place (or monorail subsidies).