Traditionally in steam days there were two types of station pilots, one for shunting stock, vans, and anything else around, and the other as a main line standby in case of need, which also got used for stock pilot etc in between.
Taunton west end long had two, one of each, the main line standby, fully coaled, most commonly being Hall 4932, Hatherton Hall, while the other, a pannier tank, was replaced in 1962 by a Class 08. Early diesel days meant the Hall had gone not infrequently gone somewhere, and been replaced by a second pannier tank, I believe it was known to be at Paddington from time to time, especially in the deep winter of 1962-3 if a Warship steam heating boiler had packed in. The only turntable around was inside the shed, so it occasionally made a quick visit into there if it suddenly had to face the other way.