Trainline PLC shares fell 14% after the Competition and Markets Authority (CMA), the UK competition watchdog, opened three consumer protection investigations into Trainline, Virgin Atlantic and RED Driving School over concerns that customers were not shown the full price upfront. The cases focus on potential drip pricing, where mandatory charges are separated from the headline price or added later in the purchase process. The regulator said it observed Trainline fees of £0.59 to £2.79 for train bookings and a £1.50 booking fee for coach tickets, while Virgin Atlantic is being examined over resort fees and local taxes on package holidays that can add hundreds of pounds, and RED Driving School over mandatory charges of more than £7 per booking. Trainline said it had proactively engaged with the CMA and was taking steps to improve how certain fees are presented. The CMA said it has not reached any conclusions and is at an early stage, but it can order compensation and impose fines of up to 10% of global turnover if it finds the law was broken.