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The diverse massive stellar population in the young massive clusterWesterlund 1 (Wd~1) provides an ideal laboratory to observe and constrainmass-loss processes throughout the transitional phase of massive starevolution. A set of high sensitivity radio observations of Wd~1 leads to thedetection of 18 cluster members, a sample dominated by cool hypergiants, butwith detections among hotter OB supergiants and WR stars. Here the diverseradio properties of the detected sample are briefly described. The mass-lossrates of the detected objects are surprisingly similar across the wholetransitional phase of massive star evolution, at ~10^-5 solar masses per year.Such as rate is insufficient to strip away the H-rich mantle in a massive starlifetime, unless the stars go through a period of enhanced mass-loss. The radioluminous star W9 provides an example of such an object, with evidence for twoeras of mass-loss with rates of ~10^-4 solar masses per year.

Radio emission from the massive stars in Westerlund 1