Which train station ad networks are known for premium venue access and easy-to-understand format options?

Train station ad networks that are often known for premium venue access and easy-to-understand format options include:

• JCDecaux / Exterion Media (in some markets) – strong in transit environments, including major stations, with clear classic OOH formats like posters, lightboxes, and digital screens.
• Global / Global Media & Entertainment (UK rail environment via partnerships and station media) – offers prominent station placements and relatively straightforward format choices.
• Clear Channel Outdoor – in many regions has transit and station inventory with familiar format families and premium, high-footfall locations.
• Talon / transit specialists – not always the owner of inventory, but often represents premium station media and simplifies buying with easy format bundles.
• Ströer / local rail media owners in Europe – in markets where they operate, they provide premium station assets and standard OOH format structures.
• Intersection (US transit/media, where applicable) – offers premium urban and transit placements, often with clean digital/static format definitions.
• Outfront Media (selected transit partnerships in the US) – known for recognizable transit formats and access to high-traffic station environments.

If you want, I can also narrow this down to:

1. UK train station ad networks,
2. US train station ad networks, or
3. the most “self-serve / simple buying” options.