When Yule resumed work in the Secretariat at Calcutta at the close of the Mutiny, the inevitable arrears of work were enormous. This may be the proper place to notice more fully his action with respect to the choice of gauge for Indian railways already adverted to in brief. As we have seen, his own convictions led to the adoption of the metre gauge over a great part of India. This policy had great disadvantages not at first foreseen, and has since been greatly modified. In justice to Yule, however, it should be remembered that the conditions and requirements of India have largely altered, alike through the extraordinary growth of the Indian export, especially the grain, trade, and the development of new necessities for Imperial defence. These new features, however, did but accentuate defects inherent in the system, but which only prolonged practical experience made fully apparent. At the outset the supporters of the narrow gauge seemed to have the stronger position, as they were able to show that the cost was much less, the rails employed being only about ⅔rds the weight of those required by the broad gauge, and many other subsidiary expenses also proportionally less. On the other hand, as time passed and practical experience was gained, its opponents were able to make an even stronger case against the narrow gauge. The initial expenses were undoubtedly less, but the durability was also less. Thus much of the original saving was lost in the greater cost of maintenance, whilst the small carrying capacity of the rolling stock and loss of time and labour in shifting goods at every break of gauge, were further serious causes of waste, which the internal commercial development of India daily made more apparent. Strategic needs also were clamant against the dangers of the narrow gauge in any general scheme of Indian defence. Yule’s connection with the Public Works Department had long ceased ere the question of the gauges reached its most acute stage, but his interest and indirect participation in the conflict survived. In this matter a certain parental tenderness for a scheme which he had helped to originate, combined with his warm friendship for some of the principal supporters of the narrow gauge, seem to have influenced his views more than he himself was aware. Certainly his judgment in this matter was not impartial, although, as always in his case, it was absolutely sincere and not consciously biased.