Add network list to transit stations (and any transit nodes)

[nvkelso]

Eg: Bart and Muni in SF, Transport for London, Metro in Paris, etc.

[nvkelso]

The goal is to allow generation of (multi) icons from this tile information.

[zerebubuth]

For multi-icon support, we would ideally be generating a list of operators?

[nvkelso]

Err, OSM calls this network.