Ticketless Travel Survey Methodology (TTSM)

This document is to be read in conjunction with the Agreement for Supply of Ticketless Travel Survey Methodology (TTSM).

The Supplier shall provide the following Services:

As part of the National Rail Contract (NRC) Chiltern is required to carry out Ticketless Travel Surveys in each Ticketless Travel Survey Period in accordance with an agreed Ticketless Travel Survey Methodology. The outputs of each Ticketless Travel Survey will include a "Revenue at Risk Rate", which is defined as follows:

"for any Ticketless Travel Survey Period, that proportion (expressed as a percentage to three decimal places) of revenue estimated by the Ticketless Travel Surveys conducted within that Ticketless Travel Survey Period to be associated with passengers travelling on the Passenger Services without a valid ticket or other valid permission to travel".

The survey contractor shall be required to propose a detailed survey plan and share a copy of a redacted example of a previous plan to CRCL, to demonstrate how the expected levels of sampling are to be achieved.

The supplier shall also share their survey methodology with the CRCL to ensure that it aligns with the

In accordance with the DFT preferred methodology, Chiltern shall target a minimum sample size of 20,000.

In order to ensure robust sampling across different lines of route, times of day, days of week, Chiltern adopts a matrix of 6 time-periods. In each route / time 'bucket' 300 observations shall be targeted (however, this will not always possible, given the unpredictability of demand levels at route / time level).