A1 A-A1 A AAR Absolute Block System Acceptance Active Suspension Add Value Machines Adhesive Weight Adhesion factor AEIF Air Bags Air Brake Air Dryer Air Suspension Alternator Analogue E-P Brake Control Angle Cock Articulation Aspect Asynchronous Motor Automatic Brake Automatic Coupler Automatic Fare Collection (AFC) Automatic Signalling Automatic_Train_Control_(ATC)? Automatic_Train_Operation_(ATO)? Automatic_Train_Protection_(ATP)? Automatic_Train_System_(ATS)? Auxiliary_Reservoir? Auxiliary Supply Availability Axle Axlebox Axle Brush Axle Load