NXWMs 50 is nowhere near the 18 & 192! There’s 17 branded buses for it and with peak workings it’s approximately 20 buses. The 11A/C Outer Circle however are well into the fourties when combined, last I heard was 49ish but that was only a guess. That’s to be expected with it being amongst the longest urban bus routes, Coventry’s version just about takes that ‘award’ !
18 is the TfL route Euston - Sudbury I assume
I just assumed that because the 50 is such a high frequency route (similar to the 192) it would be similar. Clearly that's not the case.
The Outer Circle is mainly in the hands of 6111-6148; I know we can't really base a PVR on how many vehicles are branded/used for the route but if we're using that logic on the 50 then it must be 37.
The 18 according to London Bus Wiki is 44, along with the 29. Highest PVR is the 38 with 59, although I'm surprised the 25 doesn't have a particularly high one at only 32, considering how frequent it runs.
I thought that Coventry circle (360A/C) was withdrawn?
Going back to the tracker, I've noticed that you can add on the registrations of buses but only one at a time. There is a link to edit several vehicles at once but not the registrations. Still, an amazing work in progress so far!