Welcome to Law.com Class Actions: Critical Mass, Law.com’s weekly briefing for class action and mass tort attorneys. I’m Amanda Bronstad. At least five lawsuits have been filed over the Sept. 25 derailment of an Amtrak train in Montana. After a defense verdict in a Georgia talc trial, could jurors have a different view of science coming out of the pandemic? Find out who got appointed in the lawsuits over Novartis chemo drug Tasigna.