Air Brakes and Train Handling Rules - Alaska Railroad

Running ReleaseGlossaryThe release of an automatic brake application while the train ismoving.Safety Control DevicesA variety of devices including event recorders, alertors, deadmancontrols, automatic cab signals, cab signal whistles, automatictrain stop equipment, and automatic train control equipment.SagA descending grade followed by a level, nearly level, or ascendinggrade. These combinations of changes in grade requireadjustments in train handling to control slack.Service Brake ApplicationA reduction of brake pipe pressure at a controlled rate thatcauses the control valve to move to a service position and applythe brakes.Slack ActionMovement of part of a coupled train at a speed different fromanother part of the same train.SlugA unit with traction motors but no diesel engine and no capabilityto propel itself. The unit receives electrical power through apower cable from an adjacent, specially equipped locomotive.Slugs are used where low speeds and high tractive effort areneeded.Split ReductionThe preferred method of applying train brakes. An initial 5 to7 psi brake pipe reduction followed by additional reductions in2 to 3 psi increments spaced 30 seconds apart. This methodreduces in-train forces.June 1, 1996 ARRC Air Brakes and Train Handling Manual G-13