There are no routes set up in the current Lincolnshire HOF file, so that's why it's not working.
Instead, you'll need to enter the Ziel number.
Press 'Line' as normal, e.g. 10000 for the 100, then Enter.
Press 'Ziel' instead of 'Route' and enter the Ziel number, e.g. 10 is the 100 Gainsborough...