My program covers 3 large hospitals, and we rotate between them (University, County Hosp, VA). None of the 3 services are able to "cap" formally. That said, when we do get THAT busy we often actively shunt appropriate admits to medicine services with us acting as consultants, simply to ensure patient safety.
It's an interesting position that Neuro is stuck in, though, and one that my fellow residents and I have talked about and kicked around lately. In the "real" world (ie, outside of academic & teaching centers), it's exceedingly rare for Neurologists to manage their own patients. We almost always act as consultants, which is usually to our benefit in terms of lifestyle. Exceptions would be Neurocritical care units, etc., but they usually have a couple of dedicated Neurointensivists managing them, as opposed to general Neurologists. During our training, though, we almost always manage our own patients. Also, most inpatient Neuro services have the same team admitting *every day*. It's not like Medicine where the manpower exists to rotate call q4, and give the off-call services a break and a chance to discharge patients. Add to that the fact that the inpatient Neuro team is often the same team taking Consults from other services and it can quickly become overwhelming at a good sized hospital...
I just finished a senioring month at our University hospital, and there was a point when it got so busy that I had to say to the staff "I think we've got too many patients to safely take care of.", and although we're not technically allowed to cap, we 'encouraged' the ED to shunt appropriate patients to other services. Bottom line I guess is that hopefully your staff is on your side and your patients' side, and if things are out of control he/she can put some staff-level weight behind supporting you...