Alice is a bit of an oddball here, since she won't volunteer for the experiments, but she will approach Ministry workers to tell them about her case - namely the fact that she assumes that her physical body back home has been killed while the rest of her was tethered to the train. She will provide pretty much any details about it, including her system number, but will seem very reluctant towards the idea of going along with any experiments unless the workers insist it's the only way to find any solution for it.