Short answer: the SNCF TGV M — marketed as Inoui, built by Alstom under the name Avelia Horizon — begins commercial service on the Paris–Lyon high-speed line in September 2026. The first trains reach 320 km/h in service, carry up to 740 seats in the high-density layout, and are about 30% more energy-efficient than the current TGV fleet. Paris–Marseille follows from 2027, then Bordeaux, Toulouse and Strasbourg through the end of the decade.
If you regularly travel between Paris and Lyon by train, the autumn 2026 timetable is worth a close look. The TGV M is the first all-new SNCF high-speed train in thirty years, and it lands on the corridor where Trenitalia France has been gaining ground since 2021. Here is what is changing, when you can ride it, and how to lock in a seat.
What the SNCF TGV M is — and why 2026 matters
The TGV M is the result of an order placed by SNCF with Alstom for up to 130 trainsets (100 dual-voltage, 30 four-voltage). It is the first brand-new TGV since the original TGV Atlantique entered service in 1989, and the first to use distributed traction — motors spread along the train instead of concentrated in two power cars. That single change unlocks most of the passenger-facing improvements:
- More seats per trainset. Up to 740 seats in the "Grande Capacité" configuration, around 20% more than the current TGV 2N2 (Duplex).
- 320 km/h in commercial service on high-speed lines.
- Modular length, from 4 to 7 cars, single- or bi-level.
- 8 bicycle / ski spaces and 12 spaces for wheelchairs and reduced mobility, a real upgrade on the current fleet.
- 30% lower energy consumption, thanks to regenerative braking and lighter aluminium carbodies.
The European Union Agency for Railways granted the authorisation to place the trainset on the market in 2025, clearing the way for paying passengers. Commercial service starts Paris–Lyon in September 2026, then Paris–Marseille in 2027, with further extensions to Bordeaux, Toulouse, Strasbourg and cross-border services operated by Eurostar.
What changes for travellers on Paris–Lyon in September 2026
For regular Paris–Lyon passengers, the visible changes will be small at launch and bigger as more trainsets enter the timetable:
- Smoother ride and lower noise. Distributed traction removes the power-car drone familiar to current TGV travellers, with larger windows, USB-C and induction charging at every seat, and a redesigned Espace Bien-Être service bar.
- More space at peak times. The 20% seat uplift is meaningful on a line that fills up at Friday-evening rush hour, especially as Trenitalia France has been draining price-sensitive demand.
- Better accessibility. Built from the start with ERTMS signalling and platform-level boarding, the TGV M shortens station dwell times and eases level access for wheelchair users.
- Same commercial speed. Top speed stays at 320 km/h, so the published Paris–Lyon journey time of around 1 hour 50 minutes does not change at launch.
How to book a TGV M Paris–Lyon seat in autumn 2026
The TGV M is sold under the existing Inoui brand — same tariff stack as today's TGV Inoui, with SNCF's Ouigo handling the price-sensitive end of the market. A few habits will get you the right seat:
- Watch the September 2026 timetable drop. SNCF typically opens seat sales 3 to 4 months before departure, so the first TGV M dates should appear on SNCF Connect in May–June 2026.
- Pick the right fare. "Prem's" or "Seconde TGV" for the cheapest flexible ticket, or "Inoui 1ère" for the quieter first-class car and a meal voucher. The TGV M's bar car is shared between classes.
- Compare with Trenitalia and the bus. Paris–Lyon is now a genuine three-way race: TGV Inoui, Trenitalia Frecciarossa from €23, and FlixBus or BlaBlaCar Bus for budget travellers. A search on Gopaxo lines up all three modes on the same dates.
- Skip the airport. The 20% capacity uplift should keep peak-hour fares cheaper than a last-minute Air France or easyJet ticket from Paris-CDG to Lyon-Saint-Exupéry once airport transfers are added.
- Check the carrier page for the full TGV Inoui timetable on the SNCF carrier page.
How the TGV M changes the Paris–Lyon competitive picture
The launch lands in a corridor where competition has intensified since 2021, when the French government opened the domestic high-speed market under EU rail packages. Three operators now fight for the same passenger:
- TGV Inoui (SNCF) — incumbent, with the densest timetable and the biggest station footprint. The TGV M is its flagship.
- Trenitalia France — up to 14 daily Paris–Lyon round trips with red Frecciarossa sets, from €23. Reported a 40% jump in passenger numbers on Paris–Lyon in 2024.
- Ouigo (SNCF low-cost) — 70+ destinations from €19, including Paris–Lyon, with stops at Marne-la-Vallée and Lyon-Saint-Exupéry airport.
For the traveller, that rivalry now means three concrete wins in 2026: lower lead-in fares, more frequent departures, and a fleet renewal on the SNCF side that the operator has been waiting on for a generation. For the overnight complement, our guide to the return of night trains covers the slow-travel side of the network. If you also fly the corridor, our London–Paris plane vs train comparison is a useful counterpoint on short-haul European travel.
In short
- SNCF TGV M (marketed as Inoui, built by Alstom as Avelia Horizon) enters commercial service on Paris–Lyon in September 2026, followed by Paris–Marseille in 2027.
- Trains reach 320 km/h and carry up to 740 seats — about 20% more than the current TGV fleet.
- The new trains are 30% more energy-efficient, with distributed traction, 12 wheelchair spaces and USB-C / induction charging at every seat.
- 130 trainsets are on order, with Eurostar also taking 30 of the four-voltage variant.
- Booking works through the existing TGV Inoui sales channel on SNCF Connect; the first TGV M seats should appear in May–June 2026 for autumn departures.
- Paris–Lyon is now a three-way race between TGV Inoui, Trenitalia Frecciarossa (from €23) and Ouigo (from €19) — compare all three on Gopaxo before booking.
Frequently asked questions
What is the SNCF TGV M?
The TGV M is the brand-new high-speed train ordered by SNCF from Alstom under the industrial name Avelia Horizon. Sold to passengers under the existing Inoui brand, it carries up to 740 seats and uses distributed traction instead of the two power cars of previous TGV generations.
When does the TGV M start carrying passengers?
Commercial service starts on Paris–Lyon in September 2026, with the first six trainsets running in a "suitable operational window" before the larger ramp-up. Paris–Marseille follows from 2027, then extensions to Bordeaux, Toulouse, Strasbourg and cross-border Eurostar services through the end of the decade.
How fast is the TGV M, and how is it different from the current TGV?
The TGV M reaches 320 km/h in service — the same top speed as today's fleet, so the published 1 hour 50 minutes Paris–Lyon journey time does not change at launch. The passenger-facing differences are about 20% more seats, a smoother and quieter ride thanks to distributed traction, USB-C and induction charging at every seat, larger windows, and 30% lower energy consumption. SNCF has ordered 130 trainsets (100 dual-voltage, 30 four-voltage) to gradually replace the TGV Sud-Est and TGV Atlantique fleets, with Eurostar also taking 30 of the four-voltage variant for services to Germany and Switzerland.
Should I book TGV Inoui or Trenitalia for Paris–Lyon?
On a like-for-like departure, compare both operators on Gopaxo before booking: TGV Inoui is denser and has the bigger station footprint, while Trenitalia France runs up to 14 daily Paris–Lyon round trips from €23 with a more generous luggage allowance and a 2+1 business layout. The TGV M closes the comfort gap but does not change the price floor set by Trenitalia and Ouigo.
A new generation of French high-speed train is finally on the rails, and Paris–Lyon is the first corridor to feel it. Watch the September 2026 timetable drop, lock in an early-morning seat to catch the first TGV M runs, and compare with Trenitalia and Ouigo on Gopaxo before you book.
