Rail Transit Systems
Mechanical kinematics, wheel-track interfaces, and traction power architectures governing guided terrestrial vehicles.
Inside this collection
Wheel-Rail Dynamics
Conical wheel tread geometry, flanged rail contact patches, hunting oscillation stability, and rail gauge widening.
Railway Bogies & Springs
Primary coil springs, secondary pneumatic air springs, bolsterless frames, yaw dampers, and axle box guidance.
Train Traction Motors & Gears
Axle-hung nose-suspended and fully suspended traction motors, quill drives, reduction gearboxes, and cardan shafts.
Overhead Wire Pantographs
Contact wire mechanical tensioning, dropper wire spacing, aerodynamic pantograph contact pressure, and electric arcing.
Continuous Welded Rails & Ties
Flash-butt track welding, neutral temperature destressing, crushed stone ballast tamping, and concrete sleeper fastenings.
Rail Signaling Interlocks
Track circuit signal detection, axle counters, absolute block logic, fail-safe relays, and automated train protection loops.
Train Air Brake Valves
Continuous train pipe pressure discharge, triple valves, tread brake cast shoes, and axle-mounted vented brake discs.
Maglev Linear Motors
Electromagnetic (EMS) attractive levitation, electrodynamic (EDS) repulsion, and stator track linear synchronous drives.
Complex machines deserve
a closer look.
We follow the forces, explain the compromises and distinguish evidence from assumption.
Our approach