It's a fact of life that diesel engines do vibrate when running slowly and buses don't usually have engines with the latest in vibration-cancelling technology such as you might find in the better cars. It's a matter of design and nothing to do with maintenance or servicing.

It's the nature of large diesel engines, they idle very roughly and the vibration is transmitted throughout the vehicle via the vehicle frame. Once the engine is revved up a bit, it smooths out. It's somewhat annoying but normal.

A bus has a diesel engine it is turning over very slow the action of a diesel is to compress air to a stage that it is hot enough to ignite a charge of diesel fuel introduced into the compressed air this puts enourmous pressure into such an engine at slow revolutions vibration of the kind you talk of is there for sure as the engine speeds up the vibrations are much less as the times of extreme pressure are very quick

Isn't this a disel engine issue? When idling I think they have quite a low RPM so the vibration tends to be a lower frequency, as soon as they move the RPMs go up and the frequency goes up. It might be due the harmonics (eg resonance frequency) the of the engine and the chasis of the bus.

It vibrates because the bus has auto transmission and when stationery and in drive the bus is trying to pull away and is being held still by the brakes, if the driver puts the bus in neutral then it will idle more smoothely.

this is called harmonics... it where low vibration frequencies generated by ignition of fuel meet with other low vibration frequencies of components masses and combine .generating larger vibrations. this only occurs at very low rpms.. as we move up just a fraction in speed, the frequencies change thus cancelling out the issue.

this i every common on large diesel engines with too slow an idle speed.

what is busses is that same as buses diesals actually struggle when sitting they need to be reved up

Large diesels often transmit vibration. It is down to engine quality rather than lack of maintenance.

Hi when buses are maintained correctly this should not happen. however so many bus companies seem to have so little time for maintenance that they need to keep them out earning money. so some aspects of servicing gets forgotten till it breaks down.

is it becuase public transport vehicles uses combustion engines and not hybrid power generator elctric vehicles.or the bus driver is probably listening to sum classic rock music.

I'm talking about the vibration of the entire bus when it's stood still in traffic or at a stop. It can be really bad but it almost goes away entirely once the bus starts moving.

Specifically the single decker busses in London are bad for this but it happens with others too.