L'articolo di Wikipedia parla di 8 o 16 carrozze:
http://it.wikipedia.org/wiki/Bombardier_ZefiroComunque sulla parte inglese (ben più precisa) si parla di questo:
http://en.wikipedia.org/wiki/Bombardier_ZefiroZefiro V300
A variant the V300 Zefiro was offered by Bombardier in association with AnsaldoBreda to Trenitalia as part of a bid for 50 new high speed trainsets in 2010. Trenitalia selected this bid as the winner on 5 August 2010. These will enter service in 2013 and will be designated ETR1000.
Zefiro 300
Formation up to 16car
Capacity
600 seats (8 car)
1,200 seats (16 car)
Operator Trenitalia
Specifications
Car body construction Aluminium carbody, UIC profile
Train length 202 m (663 ft) (8 car train), 402 m (1,319 ft) (16 car train)
Width 2.9 m (9 ft 6 in)[citation needed]
Maximum speed 300 to 360 km/h (186 to 224 mph)
Weight (?)
Axle load ~17 t (16.7 long tons; 18.7 short tons).
Acceleration > 0.6 m/s2 (2.0 ft/s2)
Power output 8.8 MW (11,800 hp) (8 car train @300 km/h/186 mph)
Power supply Overhead catenary
Electric system(s) 1.5 & 3 kV DC, 15 kV 16.7 Hz & 25 kV 50 Hz AC
Current collection method Pantograph
Bogies "FLEXX speed", 2.85 m (9 ft 4 in) wheelbaseì
Multiple working Possible for two 8-car trainsets,
not possible for 16-car trainset