Noisy track just north of Baker St

I complained about it several months ago and got a standard response, saying their engineers are working on it. For some trains it isn't so bad, but for others, it is indeed awful and I always grimace in anticipation when taking the Jubilee southbound to Baker St.

Trains heading north from Baker Street proceed at reduced speed which I think is 25mph until they have passed over no.11 points  (Jct with the Bakerloo). Recent rail replacement or worn out rails can result in extra noise although both of these factors are equally dependant on the state of the wheels too.

edwin , Bond Street to Baker Street (and vice versa) is a different matter.
You may or may not be aware of the historic issues with this section of tunnel that was constructed in 1971 to relive pressure of the Bakerloo line by creating what was then coined as the Fleet line. The tunnels in these areas are bored through notably acidic ground. The unreinforced pre-cast concrete tunnel rings were deteriorating rapidly by the turn of the second millennium mainly caused by acidic water ingress in the tunnel lining. These factors made this portion of the Jubilee line notoriously unreliable leading to numerous cases of disruption. Those of you who watched the 2011 BBC documentary "The Tube" will remember when corrosion on bracket cables on this part of the line resulted in a train prising off a spool of copper cabling, getting entangled with the wheels and short circuiting the traction current in the process requiring the evacuation of the stranded trains.

Between the Junes of 2013 and 2015, the relining of around 400 tunnel rings were carried out going from the 17 unreinforced concrete segments that made each tunnel ring to 5 Spheroidal Graphite Iron (SGI) segments that were aimed to prevent the level of ingress previously experienced. The resulting tunnel works has also allowed track renewals to take place and I myself have heard "tunnel howls" that were usually found on the Jubilee line extension or the Victoria line.

This video was put up by Transport for London in 2016 after the completion of the project to showcase their digital engineering capabilities. Whilst not entirely relevant for this thread it gives some background information to the work that was undertaken at the time.