The Washington DC Metro is a marvel of modern engineering - 1968 engineering - and it shows. Perennially underfunded, they don't have a "strategic vision", despite being the nation's second busiest transit system.
This grainy cell phone picture shows water dripping audibly in the tunnel next to the electrified third rail into a grate where the lights go. That green smear under the grate is a rather sizable plant which has volunteered to grow there for a while now. It's got everything it needs -- light, water, soil (presumably), and an inattentive Metro management.
Do you think the train is maintained any better?