I was going to say that there's also the Hornby Rocket, but that's pre Victorian by 8 years. Trvithick's Penydarren is even earlier. According to the Antics website, the Bachmann OO BR J72 Tank 68727 has Victorian origins, but how much it was modified I don't know. Der Adler was built at the Forth Street Locomotive Works behind what is now Newcastle Central Station. The works have been partly restored and are now open to the public on some weekends.