Understanding Track Access Charges

Hello! Welcome back to your course on the economics of UK trains.

In our last lesson, we established the economic rationale for the Office of Rail and Road (ORR). We saw that because Network Rail's infrastructure is a natural monopoly, an independent regulator is needed to ensure fair access and set prices. We concluded by introducing the concept of a two-part tariff—a combination of variable and fixed charges—as the ORR's primary tool for this regulation.

Today, we will dissect that tariff. This lesson directly addresses the learning outcome: Analyze the structure and economic purpose of track access charges levied on train operators.

We will move from the "why" of regulation to the "what" of the charges themselves. We'll break down the bill a train operator receives from Network Rail, examining each component to understand its specific structure and, more importantly, the economic objective it is designed to achieve.

1. The Architecture of Access Charges

The system of access charges is a complex but logical framework designed to achieve multiple economic goals simultaneously: signalling the cost of using the network, ensuring the infrastructure is financially sustainable, and providing incentives for efficient behaviour.

To get a comprehensive overview, we will use a user guide published by the ORR. It systematically details the charges that were in place for Control Period 6 (2019-2024). While we are now in CP7, the fundamental structure and purpose of the charges remain the same, making this an excellent foundational document.

As the table shows, the charges can be grouped into distinct categories. The most important economic distinction, which we'll use to structure our analysis, is between charges that vary with usage and those that are fixed. The more recent ORR guidance for CP7 (resource fc939) makes this distinction explicit, categorising charges into two families:

1. Variable Charges: These recover costs that are directly incurred by Network Rail when a specific train service runs. They act as a price signal for the marginal cost of using the network.
2. Infrastructure Cost Charges (ICCs): This is a blanket term for charges that recover a portion of the fixed costs of the railway—costs that do not change in the short term whether one more train runs or not. These are essential for Network Rail's long-term financial viability.

Let's now examine each of these families in detail.

2. Variable Charges: Paying for Marginal Costs

Variable charges are designed to reflect the costs that an additional train imposes on the network. In economic terms, they are an attempt to implement marginal cost pricing. The goal is to ensure that operators only run services where the benefit of the service is at least as great as the short-run cost it imposes on the infrastructure.

a) Variable Usage Charge (VUC)

The VUC is the primary marginal cost charge. It reflects the physical wear and tear on the track caused by a train.

• Economic Purpose: To make operators face the direct cost of the physical damage their trains cause. This encourages efficient use of the network—a train should only run if its revenue (or social benefit) exceeds this marginal cost. It also creates a direct financial incentive for operators to procure and use rolling stock that is lighter or has better suspension, as this will result in lower VUC rates.
• Structure: The charge is levied per mile, with rates differentiated by vehicle class. Heavier and less sophisticated vehicles pay a higher rate, reflecting the greater damage they cause. This is a direct application of the cost causation principle.

b) Electrification Asset Usage Charge (EAUC) & Traction Electricity Charge (EC4T)

These are two other key variable charges, both related to running electric trains.

• EAUC: This is conceptually identical to the VUC but applies specifically to the wear and tear on electrification assets like overhead lines and conductor rails.
• EC4T: This is not a "charge" for infrastructure in the same way as the others. It is simply the mechanism by which Network Rail bills operators for the electricity their trains consume. Network Rail buys the electricity in bulk and passes the cost on to operators, based on either on-train metering or modelling. Its purpose is pure cost recovery for a consumed resource.

3. Infrastructure Cost Charges (ICCs): Recovering Fixed Costs

Variable charges alone are insufficient to fund the railway. The fixed costs of operating, maintaining, and renewing the network—signalling systems, tunnels, bridges, and staff—are enormous and must be recovered. This is the role of the ICCs.

These charges are the "mark-up" above marginal cost that a natural monopoly needs to be financially viable. A key principle here, rooted in the work of Frank Ramsey, is that these mark-ups should be levied in a way that minimizes economic distortion. In practice, this means charging more to market segments that are less sensitive to price—or, in regulatory terms, those that "the market can bear." This leads to different types of fixed charges for different types of operators.

a) Fixed Track Access Charge (FTAC)

This is the main fixed charge paid by government-contracted passenger operators (the successors to the old franchises).

• Economic Purpose: The FTAC is the balancing item that ensures Network Rail meets its total revenue requirement set by the ORR during a periodic review. It is not designed to send a price signal to the operator, because in practice, the government (the funder) pays it. The operator is 'held neutral' to it. Its purpose is purely financial: to channel public subsidy to the infrastructure owner in a structured way.
• Structure: A pre-determined annual lump sum, which is not affected by the number of trains an operator runs. This makes it a true fixed cost from the perspective of the funder's budget.

b) ICCs for Freight and Open Access Operators

Commercial operators—those who do not receive government contracts and take on revenue risk—are treated differently. They pay a specific, usage-based ICC instead of the FTAC.

• Economic Purpose: To secure a contribution to fixed costs from commercial services, but only to the extent that it does not deter their operation. The ORR conducts analysis to estimate the price sensitivity of these markets. For example, freight carrying high-value goods with few road alternatives can "bear" a higher charge than a more marginal commodity. Similarly, open-access passenger services on profitable interurban routes are deemed able to contribute more than those on other routes. This is a practical application of Ramsey-Boiteux pricing.
• Structure: These are typically structured as a charge per mile or per tonne-mile. Unlike the FTAC, this charge varies with usage, acting as an additional variable cost for these operators. This means it directly influences their decisions on service levels and profitability.

4. Other Charges: Stations

Finally, there are specific charges to cover the costs of stations, which are distinct from the track.

• Station Long Term Charge (LTC): Recovers the long-term costs of maintaining, repairing, and renewing station buildings, platforms, and canopies.
• Qualifying Expenditure (QX): Recovers the day-to-day operating costs of a station, such as cleaning, staffing, and utilities.

These are typically recovered from operators based on their share of departures from a station. Their purpose is straightforward cost recovery for a specific set of assets and services.

Conclusion

We have deconstructed the complex system of track access charges into its core components. The structure is not arbitrary; it is a sophisticated economic mechanism designed to manage the trade-offs inherent in a natural monopoly.

Key Takeaways:

• The charging framework is a two-part tariff designed to balance efficiency and cost recovery.
• Variable Charges (VUC, EAUC) act as a price signal for the marginal cost of network usage, encouraging efficient operation and investment in track-friendly technology. The EC4T is a direct pass-through of electricity costs.
• Infrastructure Cost Charges (ICCs) are the "mark-up" used to recover the network's enormous fixed costs.
• The structure of the ICC depends on the operator's business model, reflecting a "market-can-bear" approach.
  • FTAC is a lump-sum payment for contracted passenger services, effectively channelling government subsidy to Network Rail.
  • ICCs for freight and open access are usage-based charges designed to extract a contribution to fixed costs from commercial operators without driving them off the network.

Preview of the Next Lesson:

This detailed understanding of the charging structure is the essential foundation for our next topic. We will see how the different treatment of contracted operators (paying FTAC) and open-access operators (paying a usage-based ICC) creates fundamentally different business models and incentives. In the next lesson, we will contrast these business models and analyze their respective impacts on competition and fares.