The blind display keeps you guessing but 334 is most likely to be working the W18 service which ran to Maerdy Colliery from Porth.
Tylorstown was named after Alfred Tylor, who started sinking the colliery at Pendyrus in 1873, evenually winning coal in 1876. After developing production it was sold to David Davies in 1894. With no local population to draw on, once production started accommodation had to be found for workers and crude wooden huts were erected prior to building the terraces of Tylorstown seen here.
Photograph by courtesy of The Bus Archive/Roy Marshall
