Why are trams heavier for their size than buses?

[eddy]

Perhaps the two of you can unite and present the world with the trailer trolleybus?

It is funny you say that because Australia seemed a tad conservative I sent an email to ABC in America after watching all the trouble with their electric bus and they wanted to know why I said it was good for 1,000 kilometers to which I replied.

“A semitrailer would not even notice an extra 2t of batteries compared to the hassle of charging”

[Myrtone]

Still, what do trams have that buses don't that makes trams heavier for their size?

[rtt_rules]

Still, what do trams have that buses don't that makes trams heavier for their size?

Simple, because they can. Trams do not comply to the same road design axle load rules

[MiCCROwavE_OVEN]

I presume that bogies weigh significantly more than wheels. Potentially the motors will also play a part - a B-Class tram has two electric motors while an articulated electric bus would only have one. A quick Google tells me that the B-Class tram is 34 tonnes while an articulated electric bus is around 25 tonnes - but also it should be noted that the B-Class is 23.6 metres long compared to standard articulated buses which are 18 metres long.
Trams and other rail vehicles also probably have stronger reinforcements than buses which might contribute to additional weight as well.

[rtt_rules]

I presume that bogies weigh significantly more than wheels. Potentially the motors will also play a part - a B-Class tram has two electric motors while an articulated electric bus would only have one. A quick Google tells me that the B-Class tram is 34 tonnes while an articulated electric bus is around 25 tonnes - but also it should be noted that the B-Class is 23.6 metres long compared to standard articulated buses which are 18 metres long.
Trams and other rail vehicles also probably have stronger reinforcements than buses which might contribute to additional weight as well.

BAsically same weight at 1.4t/metre of length.

However that bendy bus has just three axles so assume (I know not true but lets go with it) equal weight on each axle thats 6t/axle unlaided.

For that tram, 3 bogies with 6 axles is 5.6 tonnes per axle.

So same axle load.