Welcome to Law.com Class Actions: Critical Mass, a weekly briefing for class action and mass tort attorneys.

This week: A new lawsuit targets Norfolk Southern and several government entities over the 2023 train derailment in Ohio. Air crashes on Jan. 29 and Jan. 31 have put the limelight on the Federal Aviation Administration, with lawsuits possible. Find out who Wyndham Hotels & Resorts has retained in a raft of sexual trafficking lawsuits in New Jersey.