What is that train ?

[class ep-09]

1Z33: 1742 London Paddington - Princes Risborough

Full train schedule for train 1Z33, the 1742 London Paddington - Princes Risborough

www.opentraintimes.com

Unusual working - express to Prince Rigsbomough from Paddington .

Does anyone know , what is the purpose of it?

 

[trainmania100]

It's a loco services railtour, 47 + 57
47805 + 57311
Stock:
3348, 3140, 1666, 3107, 3125, 3148, 3100, 80044, 3122, 3045, 17013

The operator LS on your link shows this.