Now that Alistair Darling has ordered a study into the cost of double-decker trains (The Times, 22 June), it would be appropriate to reconsider the tunnel diameters of the proposed Crossrail project, which currently would only allow single-decker trains. Let's not lock in these restrictions on future projects.
The Channel Tunnel Rail Link is built to take doubledeckers. Surely the Crossrail design could be modified to increase the tunnel diameter by the necessary amount (less than 1m).
For the record, one of the earlier alternatives to the favoured Crossrail Scheme did include the ability to take double-deckers.
Neil Sandberg, joint managing partner, sandberg@sandberg. co. uk