What makes the Zürcher S-Bahn special is, that it youses doubldecker carriages on allready existing normal gauge tracks, and so it can transport more passengers with less wagons. (Norm is Loc, 2. Class, 2. / 1. Class, 2. Class Stearing).
Picture taken from Bahnbilder.de
About the Driving Engine:
Type: Re 450 000 ... 114
Year: 1989 - 1997
Wight: 74 t
Power: 4350 PS / 3200 kW
Max Speed: 130 km/h
The Re 4/4 IV (Lok 2000) allready featured in Locomotion is a successor of this Re 450.
More Info about the Zürcher S-Bahn in German here
About the composiition of the train:
As mentioned above, a full S-Bahn train consists of a engine, 2 middle wagons (Type A and AB) and a stearing wagon and build a unit of about 100 meters lenght and can transport about 400 Passengers. One unit can be connected with one or two more units. (Most stations have a limit of 300 meters).
PS: Please forgive my bad english, but I try.