---
title: "Suburban trains #1: the return of the magic wand?"
url: "https://www.systra.com/en/expert_insights/suburban-trains-or-the-return-of-the-magic-wand/"
type: expert_insights
date_published: 2023-02-03
date_modified: 2023-02-06
schema:
  @type: WebPage
language: en-US
word_count: 1555
reading_time: 8 min
canonical: "https://www.systra.com/en/expert_insights/suburban-trains-or-the-return-of-the-magic-wand/"
type-insight:
  - Suburban trains
---

# Suburban trains #1: the return of the magic wand?

**It was an announcement that surprised and delighted and reopened a long-standing debate: on 22 November, the French president called for a “great national ambition” that should lead to the development of an RER-type service in 10 French cities based on the existing rail networks. A few days earlier, 15 regional presidents launched an appeal for a “new rail deal”, also seen as a response to the challenges of climate change.**

**But if the question of the development of these suburban trains is generating renewed media interest, it is far from being the first time it has been discussed. Indeed, the idea of maximising the potential of **
t
**hese networks has been regularly raised for several decades in an attempt to respond to a range of issues, even if it means making it a quasi-miraculous solution. **

**What needs can these services really meet? What prospects do they open up for the territories? What are the obstacles to their development? Our experts take a look at the issue.**

## 󠀁**Suburban trains: a widely shared rationale**󠁿

**Decarbonising mobility is a crucial issue for ecological transition**,
especially with the renewal of France’s climate commitments at the end of COP27
in Sharm el-Sheikh.

The ambition is not new; its latest concretisation dates back just three years
with the promulgation of the Mobility Orientation Law (LOM) and its multi-year
budget of 17 billion euros, half of which was earmarked for rail. In the wake of
this legislation, which gives legal existence to Metropolitan Express Services
(SEM), an SNCF Réseau master plan identified some thirty eligible cities in
2020.

But why focus on railway networks and the development of suburban services?

The justification for developing these services is clear and generally shared:

- On the one hand, to rely on the
  **structuring effect of the train on regional planning **to try to channel
  urban development around stations and stops;
- On the other hand, to offer a credible alternative to the solo car to
  suburbanites in order to **decarbonise daily mobility**,
- And finally, to provide a **social solution **in the face of rising fuel
  prices and traffic and parking restrictions in low emission zones for the most
  polluting vehicles (gradual implementation until 2025).

![](https://www.systra.com/wp-content/uploads/2023/02/passagers-quai-1024x702.jpg)

### 󠀁**30 years of debate: suburban trains facing the complexity of rail arbitration**󠁿

If everyone agrees, then why have commuter trains not been deployed more quickly
in France?

There is no shortage of challenges in implementing them:

- Firstly, it is often forgotten that the development of rail infrastructure and
  services, however structuring they may be, are also **long-term projects **and
  require significant investment.
- Secondly, in the face of the complexity of the system, we sometimes forget
  certain initial trade-offs that have ended up shaping current service
  policies. Hence the importance of **reopening the debate **and building a new
  railway consensus.

To understand this point, it is necessary to go back to the question of the use
of rail infrastructures in France. And to remember that the existing railway
networks are currently used for many services and that the cohabitation between
these different uses is complex: high speed, intercity, regional express trains,
freight, work and maintenance periods, etc.

### Competition between services according to political agendas and complicated alignment

Understanding the issues related to mixed traffic and its management constraints
is a key issue in addressing the subject.

The capacity of the railway infrastructure is measured in train paths and
depends on several factors, such as the number of tracks, the type of signals,
the number of blocks, etc. In addition, the speed difference between trains is a
key variable. In fact, the capacity of the infrastructure is optimal when all
trains run at the same speed and make the same stops.

![](https://www.systra.com/wp-content/uploads/2023/02/metrolinx-1024x683.jpg)

To explain this key yet complex point, it is necessary to understand that in the
case of cohabitation of fast and slower trains, it is necessary to increase the
spacing between trains for safety reasons, particularly in relation to the risk
of trains catching up and colliding. In order to increase capacity, it is then
possible to either slow down fast trains or increase the speed of slower trains
(eliminating stops, etc.).

The challenge posed by the suburban trains is therefore considerable and
reinforces past debates on the balance of train path allocation between fast
services (TGV, Intercity), local services, freight services, night trains and
the necessary maintenance operations and work on technical installations.

Taking a step back, it can be said that
**the current logic for allocating train paths prioritises services that allow the infrastructure to be used at its optimum capacity, i.e. the fastest services.**

**From then on, suburban trains will add a further layer of complexity to these architectures**
, reactivating the trade-offs at constant infrastructure level between fast
services from one metropolis to another, fine services to regional areas and
intra-metropolitan issues. The regions and metropolises have objectives that may
be divergent: while the regions and metropolises agree on a fast service to the
capital, the regions are concerned with regional territorial equity, while the
metropolises are looking for a quarter-hourly service to their conurbation.

![](https://www.systra.com/wp-content/uploads/2023/02/copenhague-1024x683.jpg)

To get out of the rut, and to imagine fine metropolitan quarter-hourly services,
**the entire rail system must be reexamined and remodelled** (at the level of
hubs, stations – train capacity, bypasses), in the current section (partial
track doubling, dynamic bypasses, etc.) and, at the same time, by facing other
complex issues such as the availability of land in dense areas, or the budgetary
constraints of local authorities…

## 󠀁**The need for a new rail deal**󠁿

Faced with the scale of the technical and organisational challenge and the level
of investment required, procrastination has often been the order of the day.

But President Macron’s announcement rekindles hopes of support commensurate with
the challenge and also makes it possible to set in motion organisational and
technical adjustments based on a clarified long-term vision, gradually removing
the obstacles.

### Existing technical levers

For example, track plans and capacity can be optimised by allowing two trains to
be parked on the same track. It is also possible to optimise and modernise
systems and signalling, or to add switches to increase the capacity of lines.

On a metropolitan scale, the transport network can also benefit secondary
stations to relieve the central station and connect the network to mass transit
systems such as metro. Investment in high-speed lines also restores capacity on
historic routes, allowing priority orders to be rearranged on the various lines.

![](https://www.systra.com/wp-content/uploads/2023/02/vienna-1024x768.jpg)

### Financial and governance schemes that need to be adapted

The first rough observation to be made is that
**a quarter-hourly metropolitan service represents an overall investment of one billion euros**
. Here again, adjustments are possible: for its new European Metropolitan
Express Network, Strasbourg has chosen to stagger its ramp-up, with a
quarter-hourly service at peak times provided by 800 additional trains in 13
stations from the launch in December 2022, and a target of 1,000 trains by the
summer of 2023. At the helm: a joint metropolitan-regional syndicate to share
the operating costs, notably through multi-year financing agreements.

**The establishment of suburban trains services raises a crucial question of governance**
: the regions, which are responsible for rail, and the metropolises have often
remained in their own way until now. The regions, by promoting regional
territorial equity, and the metropolises, by pushing the need for metropolitan
services without financial compensation, since they do not have rail competence.

This logical framework is in line with the distribution of competences foreseen
by the legislator. But as we have understood,
**to go further, it is a new logic of cooperation that seems to have to be installed in the metropolis/regions couple, **
notably for the financing of the operation of suburban train services.

In addition, many financial avenues remain to be explored, such as the
**development of land around stations**, or the **interfacing of fare policies**
at the territorial level. However, there is no single solution; solutions must
be found in each metropolis.

## 󠀁**no “magic” answer**󠁿

If the ambition is welcome but the concretisation is still vague, the
metropolitan trains have the merit of re-launching the debate around central
questions for sustainable mobility, the ecological transition of the
territories, and the future of our railway network.

The fact that suburban trains services have survived for decades while
maintaining their relevance is proof of their adaptability to complex and
evolving issues. But we must be careful not to make them a “magic” answer. The
reflection on their appropriateness must, in cascade, lead to a wider work on
intermodality, urban sprawl, preservation of natural spaces, quality of life,
evolution of work and consumption patterns…

**These are issues that reshuffle the deck and that cannot be resolved by a suburban train alone! In any case, an impetus from above will not be useless in clarifying priorities: regions and cities alike are now waiting for the financial commitments that the State must present at the beginning of 2023 in order to make the announcements made by Emmanuel Macron a reality.**

**Coming soon: an Expert’s Insight on suburban trains from India, the US and Asia.**