If it sounds like an intercity express train in your kitchen whilst on spin, almost inevitably the drum bearings will have failed. The worst part is that this did not happen overnight, it takes a couple of weeks for bearings to get so bad. Early intervention can save money on such a repair, ignoring the noise will ultimately increase the repair cost.
Drum bearing failure is mainly due to water ingress as the drum shaft seal wears. The oil seal is supposed to keep the wash water away from the bearings, sadly, wear and tear take their toll on the rubbers and metals used in bearings, drum shafts and collars, all of which are subjected to detergents and bleach during a wash cycle. Eventually failure is the only option, and as the bearing run dry and hot the wear and tear increases fast and noisily.
There are signs to look out for:
1) Increased noise on spin
2) Oil marks on clothing
3) Undue noise from moving the drum by hand whilst unloading the appliance
Replacing bearings is the most economical repair, if you can catch them in time, our advice would be that a bearing replacement would be a job for a washing machine service company, if you leave it too late the economic choice just might be a replacement washing machine.