I also agree with Mac but the whole issue needs looking at again whilst standing well back.
I was intrigued, but not surprised, by the answers you got from
NRE‡ and
XC▸ and also how they differed. One explanation might be that NRE, not of course in the business of actually running trains, were covering their backsides with a modus operandi of "if there's doubt then err on the side of caution." The staff at XC were however more positive, even to the extent of giving you advice to refer a RPO back to them (presumably your query had been logged).
But all of this got me thinking - does anybody know of any circumstances under which an easement would be withdrawn during engineering works? I know of one example when an easement only applied
during a
PW▸ possession, and that was when Box tunnel was closed for electrification work not long ago, and posters appeared at Chippenham advising Bristol-bound travellers that they could travel via Swindon. This, however, didn't stop an RPO trying to tell me I was on the wrong train when half way up Filton bank, but that was quickly and easily resolved.
But going back to the easement in question, I struggled to think of any circumstances that may result in this Bromsgrove to Brum easement being suspended. The closest I got was a possession closing Barnt Green to Bromsgrove with XC trains having to go via Banbury. In such a case, by the time you got the replacement bus to Barnt Green, then a stopper into Brum, and then coming south "the pretty way" by XC, the journey would probably have taken longer than if you took your chance with
GWR▸ going via Worcester. But even then, would XC actually bother to formally and temporarily withdraw the easement for the duration? To me it sounds like more trouble than it was worth, especially taking into account the very small number of passengers that it would actually apply to.
Finally, after having some direct personal experience of telephone enquiries (on nights the Bristol
TM‡ enquiry office closed and calls were put through to the
ASM▸ 's clerk - ie. me one week in three), this is not the sort of query that they would expect. I suspect that the person answering the phone only had limited knowledge of what you were talking about hence the delay whilst they "kicked the matter upstairs."
And if you went as far as quoting the easement number to them I suspect their internal conversation started with: "I've got a right one 'ere..."