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Stock answer

Letters

In discussion of the relative roles of track and rolling stock in causing rail cracking it may be relevant to note changes in recent years in the weights and speeds of locomotives on the fastest express trains using the East Coast Main Line.

The IC125 diesel high speed train has a maximum speed of 125mph and weighs 66 tonnes.

The new IC225 electric Class 91 has a maximum speed of 140mph and weighs 85 tonnes.

It is obvious that the change to IC225s must have greatly increased stresses on the track.

AN Beal (M), 10 King George Street, Chapel Allerton, Leeds LS7 4LH

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