Tomos y Tanc : Un trên glas /
Awdry, W.
Beylon, Cathy.
Whelan, Luned.
Caerdydd : Hughes a'i Fab,
1996.
Arg. Saesneg cyntaf = First English ed.: Llundain: Heinemann, 1996
'Wedi'i seilio ar y 'Railway series' gan y Parch. W. Awdry' - back cover
Thomas the Tank Engine (Fictitious character)
Steam locomotives