Linear synchronous motors (LSM)
Timed magnetic pulses pull the train along — precise and common on multi-launch coasters.
LSM launches use magnets on the train synchronized with switching coils on the track — like a linear version of a rotary motor.
They can deliver very high acceleration with good repeatability, which parks like for dispatch reliability.
Guests experience LSM and LIM similarly: sudden speed. Maintenance teams care about gap tolerances, power substations, and fin condition.
Multi-launch layouts (forward, backward, relaunch) often lean on LSM because timing and power delivery are controllable.