It's perhaps worth remembering that the old fashioned pre-1940s trams in Nottingham also used to run up Market Street.
I can't answer for the Sheffield or Birmingham systems, but I wouldn't be at all surprised if the 'old' trams in many areas of the country also coped with similar gradients.
I read somewhere there is a 13.5% adhesion worked gradient in Lisbon although Google finds a couple of people suggesting it is 14%. I suspect if one fails on that they will have to pull it out with a road vehicle, or let it roll down to somewhere less steep.
Pretty sure the Sheffield network has gradients of up to 10% using trams with all axles motored (I'll ask a collegue who is working on the tram-trains whether they do as well). The Nottingham Incentro has five bogies and eight motors according to Wikipedia, and I assume the Citadis are similar. Croydon and Manchester have two bogies motored out of three and both have a ruling gradient of around 6.5%, though as pointed out the short section on Church Street is steeper but used downhill only. Usually the gradient is set not by what the trams can cope with on their own, but by the need for a working tram to pull or push a failed one.
I read somewhere there is a 13.5% adhesion worked gradient in Lisbon although Google finds a couple of people suggesting it is 14%. I suspect if one fails on that they will have to pull it out with a road vehicle, or let it roll down to somewhere less steep.
Certainly not, they've tendered for stock capable of a maximum 6% gradient.
IndeedI doubt that any tram line will be steeper than the famous ones around the Graca area of Lisbon - routes 12 and 28 if I remember correctly.
Which indicates to me that Crystal Palace was nothing more than a worthless Boris Johnson mayoral election 'promise'.
Indeed
on the 28 you have the Calçada do Combro ( calçada = very steep street; ç = ss )
Calçada do Combro
Links didn't work for me, but see here from about 49 secs onwards:
https://www.youtube.com/watch?v=xPxos2UT8EU
(and lots of other videos.)
Do rubber-tyred trams count ?
Yes, hence my question. Comfort-wise there aren't any differences compared to conventional steel systems.