Schiphol Airport <> Amsterdam Central is a very short line with only stops at Amsterdam and Schiphol. It's also known as the Tourist Express/train. Each hour, there drives 4 Sprinters and 2 IC Directs and 1 Intercity. Rolling stock on this line are: SLT SNG BR186 - ICRmh - BR186 The DD-IRM is out of service and its father and grandfather (VIRM & VIRMm) doesn't drive this line according to this years timetable.
So it's even shorter than Isle of Wight. :P Although I think both Amsterdam Central station and Schiphol Airport station would be interesting parts of a route, you really need something more than just the short section of railway between those two points, as they're really close to each other. Perhaps something like this would be a better suggestion? https://forums.dovetailgames.com/threads/amsterdam-schiphol-airport-amersfoort-lelystad.25095/
This could be small extension for the Amsterdam-Arnhem Railway, almost completing the entire Intercity 3100 Service, only thing needed would be an Extension from Arnhem to Nijmegen