One train driver survived the head-on crash that killed at least 18 people outside of Brussels and will be questioned as soon as his serious injuries permit it, railway officials said Tuesday as the search resumed for more victims. The Eurostar and Thalys high speed trains from London and Paris to Brussels were suspended for a second day Tuesday and other train conductors held a wildcat strike that paralyzed train travel across southern Belgium. Rescuer workers picked through the wreckage of the two commuter trains that collided Monday in one of the deadliest rail accidents in Belgian history. In addition to the deaths, rail officials said 95 people were injured, some seriously. National Railways spokesman Jochen Goovaerts said investigators will examine the black boxes of the two trains to try to determine whether mechanical failure, human error, freezing weather or another factor was primarily responsible for the crash near a suburban station 9 miles (15 kilometers) south of Brussels. The black boxes, recording all the technical data of the journeys, should reveal how fast the trains were moving when they collided, said Goovaerts. “There are a lot of possible explanations to this tragedy,” he said. “We don't want to put the blame where it doesn't belong.” The accident scene was sealed off Tuesday with police tape. One passenger car from each train was tipped onto its side, and it was unknown whether more bodies were trapped underneath. Lodewijk De Witte, the governor of the province of Flemish Brabant, told reporters Monday that one train apparently did not heed a red signal, as the second train – leaving 10 minutes late from the station at Buizingen – moved onto the track of the oncoming train. Goovaerts said the survivor was driving the train approaching the station. Infrabel, the rail management company, said its technical teams would need three days to inspect six rail lines once the wreckage is removed, meaning train traffic was likely to remain disrupted in the capital for the rest of the week.