After some modifications and the numbering of P1, the locomotive was put into service on 14 April 1921, wearing a lined black livery. It had been hoped to use it on the Ulverstone - Nietta line, but was deemed unsuitable; it was subsequently employed on an extension of the route from Myalla to Wiltshire, but again failed to make an impression. The TGR therefore attempted to sell the locomotive later that year.[1]
Thereafter, P1 worked as a shunter around the Launceston roundhouse and workshops, accruing low mileage. It was overhauled in 1927 and 1932 and, according to uncorroborated word of mouth recollections, may have run Melrose branch on limestone trains.[1]
It is not known when the locomotive was withdrawn, as it is not mentioned in any official documents until 31 January 1945 when it was proposed for written off. It was dumped at Launceston until February 1951, when it was transferred to Mowbray in October that year and sold for scrap. The actual date of scrapping is not known.[1][2]