This has been puzzling me, and I can't find much info on it. Looking at a ticket for Newcastle, from say York, you can have either one to Newcastle (NCL), Newcastle Central Metro (NCZ) or Newcastle Airport (APN), aside from the fact that normal rail tickets are valid between Sunderland and Newcastle as well.
The question is, what is the difference between NCZ and APN? Is it a case that an APN ticket is valid only between NCL and APN, and that a NCZ is a ticket for anywhere else on the Metro? There is no info on nationalrail.co.uk that I can find, nothing on Nexus that I can find either, and Advantix doesn't show tickets between York and NCZ or APN.
The question is, what is the difference between NCZ and APN? Is it a case that an APN ticket is valid only between NCL and APN, and that a NCZ is a ticket for anywhere else on the Metro? There is no info on nationalrail.co.uk that I can find, nothing on Nexus that I can find either, and Advantix doesn't show tickets between York and NCZ or APN.