"They came up on us so fast that I could see Carl trying to block and he finally said there's no real way to block the speed that they're bringing, " Johnson said.
The so-called manual-block system takes the place of a dozen separate signals that help drivers adjust their speed and avoid colliding with other trains in the dark tunnels.
In trucks equipped with the eight-speed transmission, the Ram can activate its (optional) aero-shutters, which block off portions of the grille to reduce aerodynamic drag.