Note the ETR 450 uses hydraulic actuators, as do the later Pendolino models, whereas the APT used electromagnetic actuators. (I'm unaware of any ETR 400 having

Note the ETR 450 uses hydraulic actuators, as do the later Pendolino models, whereas the APT used electromagnetic actuators. (I'm unaware of any ETR 400 having ever existed; the prototype ETR 401 did, but that used passive tilt rather than the active tilt developed by BREL.) SIG, then owned by Fiat Ferroviaria, built the electromagnetic actuators used by the Swiss ICN and the British Class 390 "Pendolino".