"Our crews will essentially be rebuilding 2, 000 feet of damaged track and overhead wires and signal system, " Metro-North Railroad President Howard Permut said in a statement.
Malloy said five people were critically injured and one was very critically hurt in Friday evening's crash on the Metro-North Railroad, which serves the northern suburbs of New York City.
Metro-North Railroad says its commuter rail service between South Norwalk and New Haven will be down for at least a few days as crews repair tracks, overhead wires and other equipment.
Metro-North railroad officials said they plan to restore full train service on the New Haven Line for the Wednesday morning rush, five days after a derailment and crash halted train service on a busy stretch of the Northeast Corridor.