Am thinking about bitting the bullet and getting an oil burner.

[Oldman]

Not  happy with the idea but the grandaughter has been pestering me about getting her track laid - basic peco set track starter set.
She has just said she would like to run a railcar but not steam, and was wondering what was out there that would negotiate set track R1 curves.
Had wondered about a 121 but not sure on the curves and set track points.

Even a kit that would fit the Kato  shorty chassis might do. 

[EtchedPixels]

Just about any diesel should handle 9" curves just fine.

If you wanted something that fitted in with the kettles you could look at the Farish GWR railcar.

[Newportnobby]

Certainly the 121 will cope with 1st radius everything, but as EP says this will also do the job

http://www.anticsonline.co.uk/1739_1_1654879.html

Finding them at the right price may not be easy tho'

[Oldman]

Spptted a GWR  railcar on the well known site only thing is a non runner.
Also thinking about a 153 ?