Not proper public transport, but my dad is an active member of a heritage railroad.

This railroad rund both steam and diesel trains.

When it is dry outside they will run a fire watch train after the steam train, basically a tank car with water and a petrol pump, pulled by a diesel locomotive.

But this day they didn't run the fire watch train, and I was tagging along with dad as he drove the classic DMU trains.

We come around a corner and see smoke comming from a farmer's field, it had caught on fire/smolder from the steam train...

We stop, obviously, bring our large water can and start working the fire, after a few min the fire department came and we could hand it over to them