dunnow.
The original plan was convert Leeds-Horsforth to tram operation with dc overheads as far as Horsforth and up the hill to the airport. This was thwarted by Leeds not getting go ahead for city tram network and objections from users on the rest of the Harrogate Loop mixing trams with heavy rail on the same lines. Tram trains were seen off by the same method.
The latest is install 25kv to Horforth and up the hill to the airport with a 15 minute interval all stations service now resignalling is complete. There are enough electric units for this service. Leeds-Harrogate trains could then run Leeds-Horsforth nonstop reducing overall journey time and overcrowding between Leeds and Horsforth on Harrogate trains.
Not sure how things stand now but from the new timetable trains are increased to every 15 minutes between Leeds and Horsforth on Sundays.