A1 A-A1 A AAR Absolute Block System Acceptance Active Suspension Add Value Machines Adhesive Weight Adhesion factor 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 Axle Axlebox Axle Brush Axle Load Bar Balancing Speed Ballast Ballast Train Banjo Bank Banking Locomotive Battery Battery Locomotive Bi-Directional Signalling Blade Bleed Hole Brake Beam Brake Blending Brake Block Brake Cylinder Brake Frame Brake Pad Brake Pipe Brake Release Valve Brake Reservoir Brake Resistor Brake Rigging Brake Systems [Brake, Types of]? [[