sentences:  10 to 13; the boilers were enlarged from 2'10.75" diameter to 3'3" and pressed to 160 psi.Whilst this did not increase the theoretical tractive effort, it was found that they were considerably less prone to running short of steam on the long climbs out of Douglas on the way to Port Erin and on the Ramsey line out of St. John's.These locomotives were built with 480 gallon water tanks.