On 1 February 1876 the South Devon Railway was amalgamated with the Great Western Railway, the locomotives were given numbers by their new owners but continued to carry their names too.

Four similar locomotives were built for the Vale of Neath Railway in 1861.

Some of these could be found working on the South Devon lines after the 1876 amalgamation.

[1] Sheppard (2008) lists Hebe, Ajax, Brutus, Argo, Atlas, Juno as the Romulus class, along with Romulus and Remus.

The Dido class (which Sheppard (2008) describes as the Ada class) consists of Dido and Hero, together with three Llynvi Valley Railway locomotives: Rosa (rebuilt from a 4-4-0ST), Ada and Una.