The NBR Class D (later LNER Class J34) was a class of 0-6-0 steam locomotive of the North British Railway, often known as the Wee Drummonds. The class was designed by Dugald Drummond (Locomotive Superintendent). A total of 101 were produced. The NBR Class D (later LNER Class J33) was an almost identical type of 0-6-0 locomotive. The design remained that of Dugald Drummond, but was slightly adapted by his successor Matthew Holmes. The changes were largely technical, whilst both classes of locomotive were virtually identical in outward appearance. A total of 36 were produced.