They then try to recover the Hudson copy, hoping that some freak of chance will have saved it from a similar fate. The atmosphere becomes increasingly panicked as extensive searches fail to discover any trace of the wrecked train, either in the wreckage of the bridge or elsewhere in the river. Extra suspense is provided by the mystery of the "ghost train" which on stormy nights howls up the abandoned trackbed and suddenly vanishes on reaching the site of the bridge.