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10 photos from Wikimedia Commons · credits & licences
- 1. RER RATP 8448: Alf van Beem· CC0
- 2. Ligne de Nanterre a Sartrouville - Viaduc de Nantere - MI84 - Avril 2012 (6): Akiry· CC BY-SA 3.0
- 3. MI 84 - Z 8100 - RATP: Mohamed SY· CC BY-SA 4.0
- 4. MI 84 rénové Reichshoffen sous caisse 1: Chris93· CC BY-SA 4.0
- 5. Mi84R exterieur: Lodaï· CC BY-SA 4.0
- 6. Mi84 Cité Universitaire station: Lodaï· CC BY-SA 4.0
- 7. RATP MI 84 Gare du Val d'Europe (1): Romain D C· CC BY-SA 3.0
- 8. Avant d'un MI 84 légèrement rénové sur la voie B depuis le quai de la voie A: Remontees· CC BY-SA 4.0
- 9. Départ d'une UM2 avec une MI 84 du RER B de la voie 43 de la gare souterraine de Paris-Nord: Remontees· CC BY-SA 4.0
- 10. Les tampons de type MI84 sur la rame Z8339-40: Réda TP· CC BY-SA 4.0
what is it?
The MI 84 (French: Matériel d'Interconnexion de 1984, English: interconnection rolling stock of 1984), 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 Île-de-France suburbs. The 73 four-car trains were built by a consortium of French manufacturers Alstom and ANF Industrie (which would be purchased by Bombardier in 1989 before the end of the deliveries). The final assembly of the trains was performed at Alstom's Valenciennes factory and ANF's Crespin factory between 1985 and 1990.
who runs it
base stats
Bars compare against all trains: 600 km/h (maglev), 1,700 seats; power, weight and number built on a log scale up to 20 MW, 1,000 t and 20,000 built.
fun facts
- First built 42 years ago, in 1984.
- 2.8 MW is about 33 family cars (~85 kW each) flat out.
- Weighs about as much as 34 African elephants (~6 t each).
- 104 m long: about 23 cars parked nose to tail.
- Still in service after 42 years.
multiple unit: A self-propelled train: motors are spread under the passenger cars, so no separate locomotive.
spec sheet
- built
- 1984
- in service from
- 1984
- status
- in service
- number built
- 73
- kind
- multiple unit
- traction
- electric
- origin
- 🇫🇷 France
- builders
- Alstom, Alstom Crespin
- operators
- RATP, Société nationale des chemins de fer français
- top speed
- 120 km/h
- power
- 2.8 MW
- gauge
- 1,435 mm standard gauge
- electric system
- Overhead line:, 3, 3
- formation
- 4 cars per trainset
- length
- 104 m
- weight
- 205 t
From the Wikipedia infobox and Wikidata. Blank means the sources don't say.
Sources: Wikidata Q104579653, Wikipedia: MI 84 (CC BY-SA 4.0).Updated 2026-10-25.