MI 79
| MI 79 (Class Z 8100) | |
|---|---|
 MI 79 train at Laplace station on the RER B line. | |
| In service | 1981–present |
| Manufacturers | Alsthom and Société Franco-Belge |
| Constructed | 1980–1985 |
| Entered service | 1980 |
| Refurbished | 2010–2015 |
| Number built | 120 trainsets (480 cars) |
| Number in service | 116 trainsets (464 cars) |
| Number scrapped | 4 trainsets (16 cars) |
| Formation | 4 cars per trainset |
| Fleet numbers | Z 8101–Z 8340 |
| Operator | RATP |
| Depots |
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| Line served |   |
| Specifications | |
| Car body construction | Aluminium |
| Train length | 104.16 m (341 ft 9 in) |
| Car length | 26 m (85 ft 4 in) |
| Width | 2.8 m (9 ft 2 in) |
| Height | 4.18 m (13 ft 9 in) |
| Doors | 4 pairs per side, per car |
| Maximum speed | 140 km/h (87 mph) |
| Weight | 205,600 kg (453,300 lb) |
| Traction system | TCO chopper/thyristor (analogic control) |
| Traction motors | 8 x CEM/Oerlikon EHO 3262 A (750 V DC self ventilated) |
| Power output | 2,824–2,480 kW (3,787–3,326 hp) |
| Transmission | Hollow shaft and cardan shaft ratio :4.047 |
| Acceleration | 1 m/s2 (3.3 ft/s2) |
| Deceleration | 1.1 m/s2 (3.6 ft/s2)
(emergency brake) 1.15 m/s2 (3.8 ft/s2) |
| Electric systems | |
| Current collection | Pantograph (type AM 62 BU) |
| Bogies | H-shape frame by ANF Industrie |
| Braking systems | Disc, regenerative, eddy current |
| Safety systems | EAS, KCVP, SACEM |
| Coupling system | Scharfenberg |
| Multiple working | MI 79 or MI 84 maximum 3 trainsets |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge |
The MI 79 (French: Matériel d'Interconnexion de 1979, English: 1979 stock interconnecting set), also known as the Class Z 8100, is a dual-voltage electric multiple unit trainset that is operated on line B of the Réseau Express Régional (RER), a hybrid suburban commuter and rapid transit system serving Paris and its suburbs. The MI 79, designed in the 1970s for the RER B which needed dual-voltage (interconnection) trainsets. They were followed by a derivative version, the MI 84, designed in the 1980s to meet the needs of the RER A line, before reassigned to the RER B in the 2010s.