These seven wagons were inherited Manx Northern Railway stock having been supplied to that company in 1900 from Hurst-Nelson Co., Ltd., of Motherwell at the same time as their two bogie carriages No.16 and No.17 (later to become F.37 and F.38).  They were originally numbered as No.13 then No.37-42 until the merger of 1905 when they were allocated their final numbers (the small “r” prefix being common to denote former Manx Northern stock across the fleet).  The final examples of this series were struck from rolling stock records in 1962.

This was the second of two batches of wagons inherited from the Manx Northern Railway, the first being Hr.27 - Hr.38 which were constructed by the Swansea Carriage & Wagon Co. in 1879 and supplied for the opening of the railway from the same supplier as the six-wheel carriages.  The reversion to the less popular three-plank type over the drop-sides which were generally favoured, is attributable to the arrival of manager David McDowell who preferred this arrangement.  Hr.39 was rebuilt from a timber truck in 1901 having previously been No.21; it was scrapped in 1961.