Product
Sei-Vord
SAY-vord
The guardian of the stop.
静止 Sei — Japanese, “stillness, at rest”+Vörðr — Old Norse, “warden, guardian”
A kinematic-determinism safety controller for rail-based attractions — invariant block-zone occupancy, braking velocity guaranteed against physical impact under worst-case friction and grade, and automatic pneumatic failsafe drop the instant telemetry exceeds the corridor.
No step skipped because a shift ran long: the invariants are enforced by the controller, not by a fatigued operator's memory of the checklist.
What’s inside
Zone logic
Track partitioned into discrete block zones B₁…Bₘ
Occupancy invariant: Occupancy(Bᵢ) ≤ 1 for every zone, always
Ingress permissive: a vehicle may enter Bᵢ only if Occupancy(Bᵢ) = 0 and BrakeStatus(Bᵢ) = CLEAR
Braking guarantee
v_max(x) = √(2·(μ_min·g + g·sinθ)·(x_boundary − x − D_safety)) — guarantees zero physical impact under minimum friction and maximum gravity assist
A telemetry excursion past v_max(x) triggers an automatic pneumatic mechanical failsafe drop — de-energize to apply, not a warning light someone has to notice