Spy Engines is an upcoming Trilogy written by BashDashCrashSmash
Many years into the future, the Steam Team has left Sodor, but Sir Topham Hatt the fifth needs them to come back to stop Diesel 10's sons, Diesel 11 and Diesel 12. The engines had formed a spy agency in america and business was slow, but this project would earn them free coal and water for a year, something that they could get on Sodor, but not in America. In the end, the engines decide to close there spy agency and reopen it on Sodor. This will begin the new spin-off "Thomas the Spy Engines and Friends"
- Sir Topham Hatt the fifth
- Diesel 10
- Diesel 11
- Diesel 12