There is catering on some local Intercity trains as well. It used to be served using small trolleys, but a few years ago they switched to backpacks and added more brands like Starbucks.

The NS is not providing structured information about where they are.

> "On Intercity's throughout the Netherlands and on the NS Hispeed train ..."

[Source](http://retail.nsstations.nl/formules/railcatering/home) (Dutch)

However, you'll have most change to find them on the longer IC tracks, e.g.:

- Utrecht <> Zwolle
- Zwolle <> Almere
- Utrecht <> Den Bosch
- Utrecht <> Deventer
- Zwolle <> Groningen

There is some info [about this on Wikipedia](http://nl.wikipedia.org/wiki/Railcatering_Utrecht), but I'm not sure how acurate it is.