Work to date comprises a rolling chassis, boiler, smokebox assembly, much of the valve gear and motionwork, some platework for cab and tanks, lubricator and various boiler fittings.
| gauge | 3 1/2 inch |
| length/inches | 36 1/2 |
| width/inches | 7 1/2 |
| height/inches | 10 1/2 |
| wheel material | cast iron |
| axlebox type | plain bearing |
| cylinder material | gunmetal |
| valve type | slide |
| valve gear | Walschaerts |
| reverser type | pole |
| lubricator type | mechanical |
| CE mark | n/a - non-commercial |
| boiler type | locomotive |
| boiler material | copper |
| superheater(s) | 3 |
| fusible plug | no |
| safety valve(s) | 2 |
| safety valve type | spring |
| mechanical pump | 2 |