Make a route between Utrecht Central to Amsterdam Centraal and then to Hoofdorp. Maybe a little route between Utrecht Centraal and Utrecht Malibaan (Railway museum) Make 2 of this iconic trains like this an 1970's type ICMm and a 1990's VIRM. One of the sprinter maybe a 1970's SGMm and a 2018's NS SNG.
Amsterdam-Utrecht is a pretty boring section of 4-track straight railroad. Although it's probably the busiest piece of railroad on our country, not sure it'd make for interesting gameplay. Not familiar with section to Hoofddorp. Also in doubt about the section to the railway museum at Utrecht Maliebaan. What's the point if it doesn't include some old heritage rolling stock?
Excellent Idea and for Amsterdam Utrecht it's the dutch section of HRR if it became the HDBU Hollandstrecke Duisburg Bochum Utrecht 202 km. Alternatively your proposal can become HDBH Hollandstrecke Duisburg Bochum Hoofdorp.